21021121121210 has 64 divisors (see below), whose sum is σ = 43272662206464. Its totient is φ = 7202373984000.

The previous prime is 21021121121179. The next prime is 21021121121213. The reversal of 21021121121210 is 1212112112012.

It is not an unprimeable number, because it can be changed into a prime (21021121121213) 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, 1465798640 + ... + 1465812980.

It is an arithmetic number, because the mean of its divisors is an integer number (676135346976).

Almost surely, 2^{21021121121210} is an apocalyptic number.

21021121121210 is an abundant number, since it is smaller than the sum of its proper divisors (22251541085254).

21021121121210 is a wasteful number, since it uses less digits than its factorization.

21021121121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27039.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21021121121210 its reverse (1212112112012), we get a palindrome (22233233233222).

The spelling of 21021121121210 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred ten".