21342020202 has 12 divisors (see below), whose sum is σ = 46241043810. Its totient is φ = 7114006728.

The previous prime is 21342020197. The next prime is 21342020213. The reversal of 21342020202 is 20202024312.

21342020202 is a `hidden beast` number, since 21 + 3 + 420 + 20 + 202 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14986901241 + 6355118961 = 122421^2 + 79719^2 .

It is a super-2 number, since 2×21342020202² (a number of 21 digits) contains 22 as substring.

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: 1185667789 = 21342020202 / (2 + 1 + 3 + 4 + 2 + 0 + 2 + 0 + 2 + 0 + 2).

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, 592833877 + ... + 592833912.

Almost surely, 2^21342020202 is an apocalyptic number.

21342020202 is an abundant number, since it is smaller than the sum of its proper divisors (24899023608).

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

21342020202 is a wasteful number, since it uses less digits than its factorization.

21342020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185667797 (or 1185667794 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21342020202 its reverse (20202024312), we get a palindrome (41544044514).

The spelling of 21342020202 in words is "twenty-one billion, three hundred forty-two million, twenty thousand, two hundred two".