21122111212122 has 64 divisors (see below), whose sum is σ = 43361876726784. Its totient is φ = 6855482874240.

The previous prime is 21122111212043. The next prime is 21122111212201. The reversal of 21122111212122 is 22121211122112.

It is an interprime number because it is at equal distance from previous prime (21122111212043) and next prime (21122111212201).

It is a super-2 number, since 2×21122111212122² (a number of 27 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

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, 117640597 + ... + 117820007.

It is an arithmetic number, because the mean of its divisors is an integer number (677529323856).

Almost surely, 2^{21122111212122} is an apocalyptic number.

21122111212122 is an abundant number, since it is smaller than the sum of its proper divisors (22239765514662).

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

21122111212122 is a wasteful number, since it uses less digits than its factorization.

21122111212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180883.

The product of its digits is 128, while the sum is 21.

Adding to 21122111212122 its reverse (22121211122112), we get a palindrome (43243322334234).

The spelling of 21122111212122 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-two".