21001020012212 has 48 divisors (see below), whose sum is σ = 38966765644800. Its totient is φ = 9875686393440.

The previous prime is 21001020012211. The next prime is 21001020012233. The reversal of 21001020012212 is 21221002010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001020012211) 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, 208726037 + ... + 208826627.

It is an arithmetic number, because the mean of its divisors is an integer number (811807617600).

Almost surely, 2^{21001020012212} is an apocalyptic number.

It is an amenable number.

21001020012212 is a deficient number, since it is larger than the sum of its proper divisors (17965745632588).

21001020012212 is a wasteful number, since it uses less digits than its factorization.

21001020012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120516 (or 120514 counting only the distinct ones).

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

Adding to 21001020012212 its reverse (21221002010012), we get a palindrome (42222022022224).

The spelling of 21001020012212 in words is "twenty-one trillion, one billion, twenty million, twelve thousand, two hundred twelve".