21469887 has 32 divisors (see below), whose sum is σ = 33269760. Its totient is φ = 13668480.

The previous prime is 21469853. The next prime is 21469897. The reversal of 21469887 is 78896412.

It is not a de Polignac number, because 21469887 - 2⁸ = 21469631 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21469807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94468 + ... + 94694.

It is an arithmetic number, because the mean of its divisors is an integer number (1039680).

Almost surely, 2^21469887 is an apocalyptic number.

21469887 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21469887 is a deficient number, since it is larger than the sum of its proper divisors (11799873).

21469887 is a wasteful number, since it uses less digits than its factorization.

21469887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 374 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 21469887 is about 4633.5609416517. The cubic root of 21469887 is about 277.9350080115.

The spelling of 21469887 in words is "twenty-one million, four hundred sixty-nine thousand, eight hundred eighty-seven".