21211112212122 has 32 divisors (see below), whose sum is σ = 51334456447872. Its totient is φ = 5703828493824.

The previous prime is 21211112212117. The next prime is 21211112212127. The reversal of 21211112212122 is 22121221111212.

It is an interprime number because it is at equal distance from previous prime (21211112212117) and next prime (21211112212127).

It is a super-2 number, since 2×21211112212122² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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

It is not an unprimeable number, because it can be changed into a prime (21211112212127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14853719323 + ... + 14853720750.

It is an arithmetic number, because the mean of its divisors is an integer number (1604201763996).

Almost surely, 2^{21211112212122} is an apocalyptic number.

21211112212122 is an abundant number, since it is smaller than the sum of its proper divisors (30123344235750).

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

21211112212122 is a wasteful number, since it uses less digits than its factorization.

21211112212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29707440102.

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

Adding to 21211112212122 its reverse (22121221111212), we get a palindrome (43332333323334).

The spelling of 21211112212122 in words is "twenty-one trillion, two hundred eleven billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-two".