21012222002120 has 16 divisors (see below), whose sum is σ = 47277499504860. Its totient is φ = 8404888800832.

The previous prime is 21012222002087. The next prime is 21012222002159. The reversal of 21012222002120 is 2120022221012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19711166955076 + 1301055047044 = 4439726^2 + 1140638^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262652774987 + ... + 262652775066.

Almost surely, 2^{21012222002120} is an apocalyptic number.

21012222002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012222002120 is an abundant number, since it is smaller than the sum of its proper divisors (26265277502740).

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

21012222002120 is a wasteful number, since it uses less digits than its factorization.

21012222002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525305550064 (or 525305550060 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21012222002120 its reverse (2120022221012), we get a palindrome (23132244223132).

The spelling of 21012222002120 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, two thousand, one hundred twenty".