21469880 has 32 divisors (see below), whose sum is σ = 48470400. Its totient is φ = 8558976.

The previous prime is 21469853. The next prime is 21469897. The reversal of 21469880 is 8896412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14201 + ... + 15639.

It is an arithmetic number, because the mean of its divisors is an integer number (1514700).

Almost surely, 2^21469880 is an apocalyptic number.

21469880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21469880 is an abundant number, since it is smaller than the sum of its proper divisors (27000520).

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

21469880 is a wasteful number, since it uses less digits than its factorization.

21469880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823 (or 1819 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 21469880 is about 4633.5601862930. The cubic root of 21469880 is about 277.9349778057.

The spelling of 21469880 in words is "twenty-one million, four hundred sixty-nine thousand, eight hundred eighty".