21121111222212 has 48 divisors (see below), whose sum is σ = 51912166521600. Its totient is φ = 6665227783200.

The previous prime is 21121111222163. The next prime is 21121111222249. The reversal of 21121111222212 is 21222211112112.

It is a super-2 number, since 2×21121111222212² (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 15 ways as a sum of consecutive naturals, for example, 31590762 + ... + 32252417.

It is an arithmetic number, because the mean of its divisors is an integer number (1081503469200).

Almost surely, 2^{21121111222212} is an apocalyptic number.

It is an amenable number.

21121111222212 is an abundant number, since it is smaller than the sum of its proper divisors (30791055299388).

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

21121111222212 is a wasteful number, since it uses less digits than its factorization.

21121111222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63844656 (or 63844654 counting only the distinct ones).

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

Adding to 21121111222212 its reverse (21222211112112), we get a palindrome (42343322334324).

The spelling of 21121111222212 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twelve".