21121021102122 has 12 divisors (see below), whose sum is σ = 45762212387970. Its totient is φ = 7040340367368.

The previous prime is 21121021102079. The next prime is 21121021102141. The reversal of 21121021102122 is 22120112012112.

21121021102122 is a `hidden beast` number, since 211 + 210 + 21 + 10 + 212 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15139577503521 + 5981443598601 = 3890961^2 + 2445699^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1173390061229 = 21121021102122 / (2 + 1 + 1 + 2 + 1 + 0 + 2 + 1 + 1 + 0 + 2 + 1 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21121021102095 and 21121021102104.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586695030597 + ... + 586695030632.

Almost surely, 2^{21121021102122} is an apocalyptic number.

21121021102122 is an abundant number, since it is smaller than the sum of its proper divisors (24641191285848).

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

21121021102122 is a wasteful number, since it uses less digits than its factorization.

21121021102122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173390061237 (or 1173390061234 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21121021102122 its reverse (22120112012112), we get a palindrome (43241133114234).

The spelling of 21121021102122 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, one hundred two thousand, one hundred twenty-two".