21076510 has 128 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 5930496.

The previous prime is 21076507. The next prime is 21076513. The reversal of 21076510 is 1567012.

It is an interprime number because it is at equal distance from previous prime (21076507) and next prime (21076513).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21076513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 397644 + ... + 397696.

It is an arithmetic number, because the mean of its divisors is an integer number (408240).

Almost surely, 2^21076510 is an apocalyptic number.

21076510 is an abundant number, since it is smaller than the sum of its proper divisors (31178210).

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

21076510 is a wasteful number, since it uses less digits than its factorization.

21076510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 21076510 is about 4590.9160305978. The cubic root of 21076510 is about 276.2270675667.

The spelling of 21076510 in words is "twenty-one million, seventy-six thousand, five hundred ten".