21121211020210 has 16 divisors (see below), whose sum is σ = 43449348384576. Its totient is φ = 7241558064048.

The previous prime is 21121211020193. The next prime is 21121211020211. The reversal of 21121211020210 is 1202011212112.

It is a super-2 number, since 2×21121211020210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121211020211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150865792932 + ... + 150865793071.

It is an arithmetic number, because the mean of its divisors is an integer number (2715584274036).

Almost surely, 2^{21121211020210} is an apocalyptic number.

21121211020210 is an abundant number, since it is smaller than the sum of its proper divisors (22328137364366).

21121211020210 is a wasteful number, since it uses less digits than its factorization.

21121211020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301731586017.

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

Adding to 21121211020210 its reverse (1202011212112), we get a palindrome (22323222232322).

The spelling of 21121211020210 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, twenty thousand, two hundred ten".