21913002 has 24 divisors (see below), whose sum is σ = 47567520. Its totient is φ = 7290600.

The previous prime is 21912977. The next prime is 21913037. The reversal of 21913002 is 20031912.

It is a happy number.

It is a super-3 number, since 3×21913002³ (a number of 23 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14377 + ... + 15827.

It is an arithmetic number, because the mean of its divisors is an integer number (1981980).

Almost surely, 2^21913002 is an apocalyptic number.

21913002 is an abundant number, since it is smaller than the sum of its proper divisors (25654518).

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

21913002 is a wasteful number, since it uses less digits than its factorization.

21913002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298 (or 2295 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21913002 is about 4681.1325552691. The cubic root of 21913002 is about 279.8340938933.

Adding to 21913002 its reverse (20031912), we get a palindrome (41944914).

The spelling of 21913002 in words is "twenty-one million, nine hundred thirteen thousand, two".