21202212402 has 32 divisors (see below), whose sum is σ = 53846889600. Its totient is φ = 6057774864.

The previous prime is 21202212397. The next prime is 21202212457. The reversal of 21202212402 is 20421220212.

21202212402 is a `hidden beast` number, since 21 + 20 + 221 + 2 + 402 = 666.

It is a super-3 number, since 3×21202212402³ (a number of 32 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28044877 + ... + 28045632.

It is an arithmetic number, because the mean of its divisors is an integer number (1682715300).

Almost surely, 2^21202212402 is an apocalyptic number.

21202212402 is an abundant number, since it is smaller than the sum of its proper divisors (32644677198).

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

21202212402 is a wasteful number, since it uses less digits than its factorization.

21202212402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56090527 (or 56090521 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21202212402 its reverse (20421220212), we get a palindrome (41623432614).

The spelling of 21202212402 in words is "twenty-one billion, two hundred two million, two hundred twelve thousand, four hundred two".