21369402 has 12 divisors (see below), whose sum is σ = 46300410. Its totient is φ = 7123128.

The previous prime is 21369389. The next prime is 21369407. The reversal of 21369402 is 20496312.

It can be written as a sum of positive squares in only one way, i.e., 19000881 + 2368521 = 4359^2 + 1539^2 .

It is not an unprimeable number, because it can be changed into a prime (21369407) 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, 593577 + ... + 593612.

Almost surely, 2^21369402 is an apocalyptic number.

21369402 is an abundant number, since it is smaller than the sum of its proper divisors (24931008).

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

21369402 is a wasteful number, since it uses less digits than its factorization.

21369402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187197 (or 1187194 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21369402 is about 4622.7050522394. The cubic root of 21369402 is about 277.5007255886.

The spelling of 21369402 in words is "twenty-one million, three hundred sixty-nine thousand, four hundred two".