21202121111210 has 32 divisors (see below), whose sum is σ = 41244724281600. Its totient is φ = 7800813016128.

The previous prime is 21202121111177. The next prime is 21202121111239. The reversal of 21202121111210 is 1211112120212.

It is a super-2 number, since 2×21202121111210² (a number of 27 digits) contains 22 as substring.

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, 288113810 + ... + 288187389.

It is an arithmetic number, because the mean of its divisors is an integer number (1288897633800).

Almost surely, 2^{21202121111210} is an apocalyptic number.

21202121111210 is a deficient number, since it is larger than the sum of its proper divisors (20042603170390).

21202121111210 is a wasteful number, since it uses less digits than its factorization.

21202121111210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576301502.

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

Adding to 21202121111210 its reverse (1211112120212), we get a palindrome (22413233231422).

The spelling of 21202121111210 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred ten".