21961484 has 12 divisors (see below), whose sum is σ = 40693464. Its totient is φ = 10334784.

The previous prime is 21961469. The next prime is 21961517. The reversal of 21961484 is 48416912.

It is a happy number.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161414 + ... + 161549.

It is an arithmetic number, because the mean of its divisors is an integer number (3391122).

Almost surely, 2^21961484 is an apocalyptic number.

It is an amenable number.

21961484 is a deficient number, since it is larger than the sum of its proper divisors (18731980).

21961484 is a wasteful number, since it uses less digits than its factorization.

21961484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322984 (or 322982 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 21961484 is about 4686.3081418106. The cubic root of 21961484 is about 280.0403173237.

The spelling of 21961484 in words is "twenty-one million, nine hundred sixty-one thousand, four hundred eighty-four".