21020112103212 has 72 divisors (see below), whose sum is σ = 54007080759632. Its totient is φ = 6891603120000.

The previous prime is 21020112103117. The next prime is 21020112103223. The reversal of 21020112103212 is 21230121102012.

21020112103212 is a `hidden beast` number, since 21 + 0 + 201 + 121 + 0 + 321 + 2 = 666.

It is a super-2 number, since 2×21020112103212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70674798 + ... + 70971594.

Almost surely, 2^{21020112103212} is an apocalyptic number.

It is an amenable number.

21020112103212 is an abundant number, since it is smaller than the sum of its proper divisors (32986968656420).

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

21020112103212 is a wasteful number, since it uses less digits than its factorization.

21020112103212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329119 (or 329114 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21020112103212 its reverse (21230121102012), we get a palindrome (42250233205224).

The spelling of 21020112103212 in words is "twenty-one trillion, twenty billion, one hundred twelve million, one hundred three thousand, two hundred twelve".