21222122121210 has 64 divisors (see below), whose sum is σ = 50991995289600. Its totient is φ = 5652691209792.

The previous prime is 21222122121197. The next prime is 21222122121223. The reversal of 21222122121210 is 1212122122212.

It is an interprime number because it is at equal distance from previous prime (21222122121197) and next prime (21222122121223).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103765431 + ... + 103969749.

It is an arithmetic number, because the mean of its divisors is an integer number (796749926400).

Almost surely, 2^{21222122121210} is an apocalyptic number.

21222122121210 is an abundant number, since it is smaller than the sum of its proper divisors (29769873168390).

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

21222122121210 is a wasteful number, since it uses less digits than its factorization.

21222122121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208315.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21222122121210 its reverse (1212122122212), we get a palindrome (22434244243422).

The spelling of 21222122121210 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred ten".