21020002012212 has 48 divisors (see below), whose sum is σ = 56821192670592. Its totient is φ = 5923444792320.

The previous prime is 21020002012211. The next prime is 21020002012223. The reversal of 21020002012212 is 21221020002012.

It is a junction number, because it is equal to n+sod(n) for n = 21020002012191 and 21020002012200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020002012211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1713953589 + ... + 1713965852.

It is an arithmetic number, because the mean of its divisors is an integer number (1183774847304).

Almost surely, 2^{21020002012212} is an apocalyptic number.

It is an amenable number.

21020002012212 is an abundant number, since it is smaller than the sum of its proper divisors (35801190658380).

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

21020002012212 is a wasteful number, since it uses less digits than its factorization.

21020002012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427919528 (or 3427919526 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21020002012212 its reverse (21221020002012), we get a palindrome (42241022014224).

It can be divided in two parts, 21020002012 and 212, that multiplied together give a palindrome (4456240426544).

The spelling of 21020002012212 in words is "twenty-one trillion, twenty billion, two million, twelve thousand, two hundred twelve".