21000021012212 has 72 divisors (see below), whose sum is σ = 42011111616768. Its totient is φ = 9099669427200.

The previous prime is 21000021012149. The next prime is 21000021012227. The reversal of 21000021012212 is 21221012000012.

It is a congruent number.

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, 4408148 + ... + 7837844.

It is an arithmetic number, because the mean of its divisors is an integer number (583487661344).

Almost surely, 2^{21000021012212} is an apocalyptic number.

21000021012212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21000021012212 is an abundant number, since it is smaller than the sum of its proper divisors (21011090604556).

21000021012212 is a wasteful number, since it uses less digits than its factorization.

21000021012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3429877 (or 3429808 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21000021012212 its reverse (21221012000012), we get a palindrome (42221033012224).

It can be divided in two parts, 210000 and 21012212, that added together give a palindrome (21222212).

The spelling of 21000021012212 in words is "twenty-one trillion, twenty-one million, twelve thousand, two hundred twelve".