21483990 has 48 divisors (see below), whose sum is σ = 60939216. Its totient is φ = 5208000.

The previous prime is 21483967. The next prime is 21483991. The reversal of 21483990 is 9938412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21483991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9861 + ... + 11840.

It is an arithmetic number, because the mean of its divisors is an integer number (1269567).

Almost surely, 2^21483990 is an apocalyptic number.

21483990 is an abundant number, since it is smaller than the sum of its proper divisors (39455226).

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

21483990 is a wasteful number, since it uses less digits than its factorization.

21483990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21725 (or 21722 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 21483990 is about 4635.0825235372. The cubic root of 21483990 is about 277.9958507394.

The spelling of 21483990 in words is "twenty-one million, four hundred eighty-three thousand, nine hundred ninety".