21077010 has 40 divisors (see below), whose sum is σ = 56675916. Its totient is φ = 5620320.

The previous prime is 21076981. The next prime is 21077011. The reversal of 21077010 is 1077012.

It can be written as a sum of positive squares in 2 ways, for example, as 19686969 + 1390041 = 4437^2 + 1179^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21077011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12201 + ... + 13820.

Almost surely, 2^21077010 is an apocalyptic number.

21077010 is an abundant number, since it is smaller than the sum of its proper divisors (35598906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21077010 is a wasteful number, since it uses less digits than its factorization.

21077010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26040 (or 26031 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 18.

The square root of 21077010 is about 4590.9704856381. The cubic root of 21077010 is about 276.2292518695.

The spelling of 21077010 in words is "twenty-one million, seventy-seven thousand, ten".