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21121321029 = 360129094027
BaseRepresentation
bin10011101010111011…
…011100100001000101
32000111222111021112020
4103222323130201011
5321224024233104
613411503113353
71345256160264
oct235273344105
960458437466
1021121321029
118a59487116
1241155a2859
131cb7ab20c3
1410451b45db
158394142d9
hex4eaedc845

21121321029 has 16 divisors (see below), whose sum is σ = 28225323840. Its totient is φ = 14049129600.

The previous prime is 21121321019. The next prime is 21121321031. The reversal of 21121321029 is 92012312112.

It is not a de Polignac number, because 21121321029 - 212 = 21121316933 is a prime.

It is a super-2 number, since 2×211213210292 (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121321019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5242914 + ... + 5246940.

It is an arithmetic number, because the mean of its divisors is an integer number (1764082740).

Almost surely, 221121321029 is an apocalyptic number.

It is an amenable number.

21121321029 is a deficient number, since it is larger than the sum of its proper divisors (7104002811).

21121321029 is a wasteful number, since it uses less digits than its factorization.

21121321029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7540.

The product of its (nonzero) digits is 432, while the sum is 24.

The spelling of 21121321029 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-one thousand, twenty-nine".

Divisors: 1 3 601 1803 2909 4027 8727 12081 1748309 2420227 5244927 7260681 11714543 35143629 7040440343 21121321029