21013020022122 has 24 divisors (see below), whose sum is σ = 45528902058276. Its totient is φ = 7004233544256.

The previous prime is 21013020022091. The next prime is 21013020022139. The reversal of 21013020022122 is 22122002031012.

21013020022122 is a `hidden beast` number, since 210 + 1 + 30 + 200 + 221 + 2 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17745063575121 + 3267956447001 = 4212489^2 + 1807749^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21013020022095 and 21013020022104.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7650243 + ... + 10027574.

Almost surely, 2^{21013020022122} is an apocalyptic number.

21013020022122 is an abundant number, since it is smaller than the sum of its proper divisors (24515882036154).

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

21013020022122 is a wasteful number, since it uses less digits than its factorization.

21013020022122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17743862 (or 17743859 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21013020022122 its reverse (22122002031012), we get a palindrome (43135022053134).

The spelling of 21013020022122 in words is "twenty-one trillion, thirteen billion, twenty million, twenty-two thousand, one hundred twenty-two".