221553412660212 has 12 divisors (see below), whose sum is σ = 516957962873856. Its totient is φ = 73851137553400.

The previous prime is 221553412660171. The next prime is 221553412660231. The reversal of 221553412660212 is 212066214355122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×221553412660212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9231392194164 + ... + 9231392194187.

It is an arithmetic number, because the mean of its divisors is an integer number (43079830239488).

Almost surely, 2^{221553412660212} is an apocalyptic number.

It is an amenable number.

221553412660212 is an abundant number, since it is smaller than the sum of its proper divisors (295404550213644).

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

221553412660212 is a wasteful number, since it uses less digits than its factorization.

221553412660212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18462784388358 (or 18462784388356 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 221553412660212 in words is "two hundred twenty-one trillion, five hundred fifty-three billion, four hundred twelve million, six hundred sixty thousand, two hundred twelve".