21869630 has 16 divisors (see below), whose sum is σ = 39526704. Its totient is φ = 8712000.

The previous prime is 21869609. The next prime is 21869641. The reversal of 21869630 is 3696812.

It is a congruent number.

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, 1847 + ... + 6866.

It is an arithmetic number, because the mean of its divisors is an integer number (2470419).

Almost surely, 2^21869630 is an apocalyptic number.

21869630 is a deficient number, since it is larger than the sum of its proper divisors (17657074).

21869630 is a wasteful number, since it uses less digits than its factorization.

21869630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8971.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 21869630 is about 4676.4976210835. The cubic root of 21869630 is about 279.6493484679.

The spelling of 21869630 in words is "twenty-one million, eight hundred sixty-nine thousand, six hundred thirty".