21089002 has 16 divisors (see below), whose sum is σ = 34854624. Its totient is φ = 9490000.

The previous prime is 21088997. The next prime is 21089009. The reversal of 21089002 is 20098012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21089009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2524 + ... + 6967.

It is an arithmetic number, because the mean of its divisors is an integer number (2178414).

Almost surely, 2^21089002 is an apocalyptic number.

21089002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21089002 is a deficient number, since it is larger than the sum of its proper divisors (13765622).

21089002 is a wasteful number, since it uses less digits than its factorization.

21089002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9605.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21089002 is about 4592.2763418592. The cubic root of 21089002 is about 276.2816298420.

The spelling of 21089002 in words is "twenty-one million, eighty-nine thousand, two".