22121121111210 has 96 divisors (see below), whose sum is σ = 62748832386240. Its totient is φ = 5362243987200.

The previous prime is 22121121111179. The next prime is 22121121111233. The reversal of 22121121111210 is 1211112112122.

It is a happy number.

22121121111210 is a `hidden beast` number, since 2 + 21 + 211 + 211 + 11 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10883830 + ... + 12755390.

It is an arithmetic number, because the mean of its divisors is an integer number (653633670690).

Almost surely, 2^{22121121111210} is an apocalyptic number.

22121121111210 is an abundant number, since it is smaller than the sum of its proper divisors (40627711275030).

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

22121121111210 is a wasteful number, since it uses less digits than its factorization.

22121121111210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883524 (or 1883521 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 22121121111210 its reverse (1211112112122), we get a palindrome (23332233223332).

The spelling of 22121121111210 in words is "twenty-two trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, two hundred ten".