21490962 has 8 divisors (see below), whose sum is σ = 42981936. Its totient is φ = 7163652.

The previous prime is 21490961. The next prime is 21490991. The reversal of 21490962 is 26909412.

It is a sphenic number, since it is the product of 3 distinct primes.

21490962 is an admirable number.

It is a super-2 number, since 2×21490962² = 923722895370888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21490961) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1790908 + ... + 1790919.

It is an arithmetic number, because the mean of its divisors is an integer number (5372742).

Almost surely, 2^21490962 is an apocalyptic number.

21490962 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21490962 is a wasteful number, since it uses less digits than its factorization.

21490962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581832.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 21490962 is about 4635.8345526992. The cubic root of 21490962 is about 278.0259192920.

The spelling of 21490962 in words is "twenty-one million, four hundred ninety thousand, nine hundred sixty-two".