21710554 has 4 divisors (see below), whose sum is σ = 32565834. Its totient is φ = 10855276.

The previous prime is 21710537. The next prime is 21710567. The reversal of 21710554 is 45501712.

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., 20205025 + 1505529 = 4495^2 + 1227^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5427637 + ... + 5427640.

Almost surely, 2^21710554 is an apocalyptic number.

21710554 is a deficient number, since it is larger than the sum of its proper divisors (10855280).

21710554 is a wasteful number, since it uses less digits than its factorization.

21710554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10855279.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 21710554 is about 4659.4585522354. The cubic root of 21710554 is about 278.9696570762.

The spelling of 21710554 in words is "twenty-one million, seven hundred ten thousand, five hundred fifty-four".