21140402202 has 12 divisors (see below), whose sum is σ = 45804204810. Its totient is φ = 7046800728.

The previous prime is 21140402191. The next prime is 21140402209. The reversal of 21140402202 is 20220404112.

21140402202 is a `hidden beast` number, since 21 + 1 + 40 + 402 + 202 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14698895121 + 6441507081 = 121239^2 + 80259^2 .

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: 1174466789 = 21140402202 / (2 + 1 + 1 + 4 + 0 + 4 + 0 + 2 + 2 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (21140402209) 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, 587233377 + ... + 587233412.

Almost surely, 2^21140402202 is an apocalyptic number.

21140402202 is an abundant number, since it is smaller than the sum of its proper divisors (24663802608).

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

21140402202 is a wasteful number, since it uses less digits than its factorization.

21140402202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174466797 (or 1174466794 counting only the distinct ones).

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

Adding to 21140402202 its reverse (20220404112), we get a palindrome (41360806314).

The spelling of 21140402202 in words is "twenty-one billion, one hundred forty million, four hundred two thousand, two hundred two".