21460402 has 4 divisors (see below), whose sum is σ = 32190606. Its totient is φ = 10730200.

The previous prime is 21460393. The next prime is 21460423. The reversal of 21460402 is 20406412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21427641 + 32761 = 4629^2 + 181^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21460402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5365099 + ... + 5365102.

Almost surely, 2^21460402 is an apocalyptic number.

21460402 is a deficient number, since it is larger than the sum of its proper divisors (10730204).

21460402 is a wasteful number, since it uses less digits than its factorization.

21460402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10730203.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21460402 is about 4632.5373177126. The cubic root of 21460402 is about 277.8940731298.

Adding to 21460402 its reverse (20406412), we get a palindrome (41866814).

The spelling of 21460402 in words is "twenty-one million, four hundred sixty thousand, four hundred two".