21055010 has 16 divisors (see below), whose sum is σ = 40128696. Its totient is φ = 7926528.

The previous prime is 21055003. The next prime is 21055033. The reversal of 21055010 is 1055012.

It can be written as a sum of positive squares in 4 ways, for example, as 20511841 + 543169 = 4529^2 + 737^2 .

It is a super-2 number, since 2×21055010² = 886626892200200, which contains 22 as substring.

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, 61757 + ... + 62096.

Almost surely, 2^21055010 is an apocalyptic number.

21055010 is a deficient number, since it is larger than the sum of its proper divisors (19073686).

21055010 is a wasteful number, since it uses less digits than its factorization.

21055010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123877.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 21055010 is about 4588.5738525167. The cubic root of 21055010 is about 276.1331098463.

The spelling of 21055010 in words is "twenty-one million, fifty-five thousand, ten".