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31221002220212 = 2276411739525419
BaseRepresentation
bin1110001100101001101001…
…01111110011001010110100
311002112200212022210012101102
413012110310233303022310
513043011103032021322
6150222421434145232
76401433353125040
oct706246457631264
9132480768705342
1031221002220212
119a47830907032
123602a0a582218
131456187c3849c
1479d166d25020
153921e36ee792
hex1c6534bf32b4

31221002220212 has 24 divisors (see below), whose sum is σ = 62539417899840. Its totient is φ = 13359555210240.

The previous prime is 31221002220181. The next prime is 31221002220223. The reversal of 31221002220212 is 21202220012213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869744762 + ... + 869780657.

It is an arithmetic number, because the mean of its divisors is an integer number (2605809079160).

Almost surely, 231221002220212 is an apocalyptic number.

It is an amenable number.

31221002220212 is an abundant number, since it is smaller than the sum of its proper divisors (31318415679628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221002220212 is a wasteful number, since it uses less digits than its factorization.

31221002220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739526071 (or 1739526069 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31221002220212 its reverse (21202220012213), we get a palindrome (52423222232425).

The spelling of 31221002220212 in words is "thirty-one trillion, two hundred twenty-one billion, two million, two hundred twenty thousand, two hundred twelve".

Divisors: 1 2 4 7 14 28 641 1282 2564 4487 8974 17948 1739525419 3479050838 6958101676 12176677933 24353355866 48706711732 1115035793579 2230071587158 4460143174316 7805250555053 15610501110106 31221002220212