21000211210120 has 64 divisors (see below), whose sum is σ = 47442177316800. Its totient is φ = 8366008992000.

The previous prime is 21000211210051. The next prime is 21000211210189. The reversal of 21000211210120 is 2101211200012.

It is an interprime number because it is at equal distance from previous prime (21000211210051) and next prime (21000211210189).

It is a self number, because there is not a number n which added to its sum of digits gives 21000211210120.

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, 153232267 + ... + 153369253.

It is an arithmetic number, because the mean of its divisors is an integer number (741284020575).

Almost surely, 2^{21000211210120} is an apocalyptic number.

21000211210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000211210120 is an abundant number, since it is smaller than the sum of its proper divisors (26441966106680).

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

21000211210120 is a wasteful number, since it uses less digits than its factorization.

21000211210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152518 (or 152514 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21000211210120 its reverse (2101211200012), we get a palindrome (23101422410132).

The spelling of 21000211210120 in words is "twenty-one trillion, two hundred eleven million, two hundred ten thousand, one hundred twenty".