21754402 has 4 divisors (see below), whose sum is σ = 32631606. Its totient is φ = 10877200.

The previous prime is 21754387. The next prime is 21754417. The reversal of 21754402 is 20445712.

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

It is an interprime number because it is at equal distance from previous prime (21754387) and next prime (21754417).

It can be written as a sum of positive squares in only one way, i.e., 15358561 + 6395841 = 3919^2 + 2529^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5438599 + ... + 5438602.

Almost surely, 2^21754402 is an apocalyptic number.

21754402 is a deficient number, since it is larger than the sum of its proper divisors (10877204).

21754402 is a wasteful number, since it uses less digits than its factorization.

21754402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10877203.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 21754402 is about 4664.1614466054. The cubic root of 21754402 is about 279.1573390017.

The spelling of 21754402 in words is "twenty-one million, seven hundred fifty-four thousand, four hundred two".