21012111020210 has 64 divisors (see below), whose sum is σ = 39115652889600. Its totient is φ = 8118351740160.

The previous prime is 21012111020207. The next prime is 21012111020213. The reversal of 21012111020210 is 1202011121012.

It is an interprime number because it is at equal distance from previous prime (21012111020207) and next prime (21012111020213).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21012111020213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1884657716 + ... + 1884668864.

It is an arithmetic number, because the mean of its divisors is an integer number (611182076400).

Almost surely, 2^{21012111020210} is an apocalyptic number.

21012111020210 is a deficient number, since it is larger than the sum of its proper divisors (18103541869390).

21012111020210 is a wasteful number, since it uses less digits than its factorization.

21012111020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22131.

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

Adding to 21012111020210 its reverse (1202011121012), we get a palindrome (22214122141222).

The spelling of 21012111020210 in words is "twenty-one trillion, twelve billion, one hundred eleven million, twenty thousand, two hundred ten".