21202413140 has 12 divisors (see below), whose sum is σ = 44525067636. Its totient is φ = 8480965248.

The previous prime is 21202413103. The next prime is 21202413149. The reversal of 21202413140 is 4131420212.

It can be written as a sum of positive squares in 2 ways, for example, as 4854744976 + 16347668164 = 69676^2 + 127858^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1060120657 = 21202413140 / (2 + 1 + 2 + 0 + 2 + 4 + 1 + 3 + 1 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202413149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530060309 + ... + 530060348.

It is an arithmetic number, because the mean of its divisors is an integer number (3710422303).

Almost surely, 2^21202413140 is an apocalyptic number.

21202413140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202413140 is an abundant number, since it is smaller than the sum of its proper divisors (23322654496).

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

21202413140 is a wasteful number, since it uses less digits than its factorization.

21202413140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060120666 (or 1060120664 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21202413140 its reverse (4131420212), we get a palindrome (25333833352).

The spelling of 21202413140 in words is "twenty-one billion, two hundred two million, four hundred thirteen thousand, one hundred forty".