21020002111212 has 48 divisors (see below), whose sum is σ = 53010176681952. Its totient is φ = 6444343872000.

The previous prime is 21020002111183. The next prime is 21020002111247. The reversal of 21020002111212 is 21211120002012.

It is a super-2 number, since 2×21020002111212² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020002111191 and 21020002111200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243176289 + ... + 243262712.

It is an arithmetic number, because the mean of its divisors is an integer number (1104378680874).

Almost surely, 2^{21020002111212} is an apocalyptic number.

It is an amenable number.

21020002111212 is an abundant number, since it is smaller than the sum of its proper divisors (31990174570740).

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

21020002111212 is a wasteful number, since it uses less digits than its factorization.

21020002111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486439298 (or 486439296 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21020002111212 its reverse (21211120002012), we get a palindrome (42231122113224).

The spelling of 21020002111212 in words is "twenty-one trillion, twenty billion, two million, one hundred eleven thousand, two hundred twelve".