21057862 has 16 divisors (see below), whose sum is σ = 36209952. Its totient is φ = 8997120.

The previous prime is 21057821. The next prime is 21057877. The reversal of 21057862 is 26875012.

It is a super-2 number, since 2×21057862² = 886867104022088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2812 + ... + 7072.

It is an arithmetic number, because the mean of its divisors is an integer number (2263122).

Almost surely, 2^21057862 is an apocalyptic number.

21057862 is a deficient number, since it is larger than the sum of its proper divisors (15152090).

21057862 is a wasteful number, since it uses less digits than its factorization.

21057862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4623.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 21057862 is about 4588.8846139340. The cubic root of 21057862 is about 276.1455771256.

The spelling of 21057862 in words is "twenty-one million, fifty-seven thousand, eight hundred sixty-two".