21211212001012 has 48 divisors (see below), whose sum is σ = 40515750475200. Its totient is φ = 9636314088960.

The previous prime is 21211212001009. The next prime is 21211212001061. The reversal of 21211212001012 is 21010021211212.

It is a congruent number.

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, 901097539 + ... + 901121077.

It is an arithmetic number, because the mean of its divisors is an integer number (844078134900).

Almost surely, 2^{21211212001012} is an apocalyptic number.

21211212001012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21211212001012 is a deficient number, since it is larger than the sum of its proper divisors (19304538474188).

21211212001012 is a wasteful number, since it uses less digits than its factorization.

21211212001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33616 (or 33614 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21211212001012 its reverse (21010021211212), we get a palindrome (42221233212224).

The spelling of 21211212001012 in words is "twenty-one trillion, two hundred eleven billion, two hundred twelve million, one thousand, twelve".