21420212202 has 24 divisors (see below), whose sum is σ = 48428306784. Its totient is φ = 6829632744.

The previous prime is 21420212183. The next prime is 21420212221. The reversal of 21420212202 is 20221202412.

21420212202 is a `hidden beast` number, since 2 + 1 + 420 + 21 + 220 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21420212183) and next prime (21420212221).

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 11 ways as a sum of consecutive naturals, for example, 25869408 + ... + 25870235.

It is an arithmetic number, because the mean of its divisors is an integer number (2017846116).

Almost surely, 2^21420212202 is an apocalyptic number.

21420212202 is an abundant number, since it is smaller than the sum of its proper divisors (27008094582).

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

21420212202 is a wasteful number, since it uses less digits than its factorization.

21420212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51739674 (or 51739671 counting only the distinct ones).

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

Adding to 21420212202 its reverse (20221202412), we get a palindrome (41641414614).

The spelling of 21420212202 in words is "twenty-one billion, four hundred twenty million, two hundred twelve thousand, two hundred two".