21051602 has 16 divisors (see below), whose sum is σ = 37098432. Its totient is φ = 8832720.

The previous prime is 21051599. The next prime is 21051623. The reversal of 21051602 is 20615012.

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, 36518 + ... + 37089.

It is an arithmetic number, because the mean of its divisors is an integer number (2318652).

Almost surely, 2^21051602 is an apocalyptic number.

21051602 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21051602 is a deficient number, since it is larger than the sum of its proper divisors (16046830).

21051602 is a wasteful number, since it uses less digits than its factorization.

21051602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73633.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21051602 is about 4588.2024802748. The cubic root of 21051602 is about 276.1182105829.

Adding to 21051602 its reverse (20615012), we get a palindrome (41666614).

The spelling of 21051602 in words is "twenty-one million, fifty-one thousand, six hundred two".