21001211210012 has 48 divisors (see below), whose sum is σ = 40108770584064. Its totient is φ = 9542303856000.

The previous prime is 21001211210011. The next prime is 21001211210027.

21001211210012 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001211210011) 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, 2310105587 + ... + 2310114677.

It is an arithmetic number, because the mean of its divisors is an integer number (835599387168).

Almost surely, 2^{21001211210012} is an apocalyptic number.

21001211210012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21001211210012 is a deficient number, since it is larger than the sum of its proper divisors (19107559374052).

21001211210012 is a wasteful number, since it uses less digits than its factorization.

21001211210012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23690 (or 23688 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

It can be divided in two parts, 2100121 and 1210012, that added together give a palindrome (3310133).

The spelling of 21001211210012 in words is "twenty-one trillion, one billion, two hundred eleven million, two hundred ten thousand, twelve".