21211212022120 has 16 divisors (see below), whose sum is σ = 47725227049860. Its totient is φ = 8484484808832.

The previous prime is 21211212022093. The next prime is 21211212022127. The reversal of 21211212022120 is 2122021211212.

It can be written as a sum of positive squares in 2 ways, for example, as 20729972908324 + 481239113796 = 4553018^2 + 693714^2 .

It is not an unprimeable number, because it can be changed into a prime (21211212022127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265140150237 + ... + 265140150316.

Almost surely, 2^{21211212022120} is an apocalyptic number.

21211212022120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211212022120 is an abundant number, since it is smaller than the sum of its proper divisors (26514015027740).

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

21211212022120 is a wasteful number, since it uses less digits than its factorization.

21211212022120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530280300564 (or 530280300560 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21211212022120 its reverse (2122021211212), we get a palindrome (23333233233332).

The spelling of 21211212022120 in words is "twenty-one trillion, two hundred eleven billion, two hundred twelve million, twenty-two thousand, one hundred twenty".