21121002212202 has 12 divisors (see below), whose sum is σ = 45762171459810. Its totient is φ = 7040334070728.

The previous prime is 21121002212117. The next prime is 21121002212209. The reversal of 21121002212202 is 20221220012112.

It is a happy number.

21121002212202 is a `hidden beast` number, since 2 + 11 + 210 + 0 + 221 + 220 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17124525436041 + 3996476776161 = 4138179^2 + 1999119^2 .

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: 1173389011789 = 21121002212202 / (2 + 1 + 1 + 2 + 1 + 0 + 0 + 2 + 2 + 1 + 2 + 2 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (21121002212209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586694505877 + ... + 586694505912.

Almost surely, 2^{21121002212202} is an apocalyptic number.

21121002212202 is an abundant number, since it is smaller than the sum of its proper divisors (24641169247608).

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

21121002212202 is a wasteful number, since it uses less digits than its factorization.

21121002212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173389011797 (or 1173389011794 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21121002212202 its reverse (20221220012112), we get a palindrome (41342222224314).

The spelling of 21121002212202 in words is "twenty-one trillion, one hundred twenty-one billion, two million, two hundred twelve thousand, two hundred two".