21620602 has 8 divisors (see below), whose sum is σ = 33549300. Its totient is φ = 10437504.

The previous prime is 21620597. The next prime is 21620603. The reversal of 21620602 is 20602612.

It can be written as a sum of positive squares in 2 ways, for example, as 20602521 + 1018081 = 4539^2 + 1009^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21620602.

It is not an unprimeable number, because it can be changed into a prime (21620603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186327 + ... + 186442.

Almost surely, 2^21620602 is an apocalyptic number.

21620602 is a deficient number, since it is larger than the sum of its proper divisors (11928698).

21620602 is a wasteful number, since it uses less digits than its factorization.

21620602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372800.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21620602 is about 4649.7959094997. The cubic root of 21620602 is about 278.5838444859.

It can be divided in two parts, 21620 and 602, that added together give a palindrome (22222).

The spelling of 21620602 in words is "twenty-one million, six hundred twenty thousand, six hundred two".