21030121222120 has 32 divisors (see below), whose sum is σ = 48210560919720. Its totient is φ = 8253330592000.

The previous prime is 21030121222093. The next prime is 21030121222147. The reversal of 21030121222120 is 2122212103012.

It is an interprime number because it is at equal distance from previous prime (21030121222093) and next prime (21030121222147).

It can be written as a sum of positive squares in 4 ways, for example, as 14951322489636 + 6078798732484 = 3866694^2 + 2465522^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4959932131 + ... + 4959936370.

Almost surely, 2^{21030121222120} is an apocalyptic number.

21030121222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030121222120 is an abundant number, since it is smaller than the sum of its proper divisors (27180439697600).

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

21030121222120 is a wasteful number, since it uses less digits than its factorization.

21030121222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9919868565 (or 9919868561 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21030121222120 its reverse (2122212103012), we get a palindrome (23152333325132).

The spelling of 21030121222120 in words is "twenty-one trillion, thirty billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty".