21000211211210 has 128 divisors (see below), whose sum is σ = 47257453707264. Its totient is φ = 6527522453760.

The previous prime is 21000211211167. The next prime is 21000211211237. The reversal of 21000211211210 is 1211211200012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 635640812 + ... + 635673848.

It is an arithmetic number, because the mean of its divisors is an integer number (369198857088).

Almost surely, 2^{21000211211210} is an apocalyptic number.

21000211211210 is an abundant number, since it is smaller than the sum of its proper divisors (26257242496054).

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

21000211211210 is a wasteful number, since it uses less digits than its factorization.

21000211211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35308.

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

Adding to 21000211211210 its reverse (1211211200012), we get a palindrome (22211422411222).

The spelling of 21000211211210 in words is "twenty-one trillion, two hundred eleven million, two hundred eleven thousand, two hundred ten".