21963654 has 12 divisors (see below), whose sum is σ = 47587956. Its totient is φ = 7321212.

The previous prime is 21963649. The next prime is 21963661. The reversal of 21963654 is 45636912.

It is a happy number.

21963654 is a `hidden beast` number, since 2 + 19 + 636 + 5 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 610084 + ... + 610119.

It is an arithmetic number, because the mean of its divisors is an integer number (3965663).

Almost surely, 2^21963654 is an apocalyptic number.

21963654 is an abundant number, since it is smaller than the sum of its proper divisors (25624302).

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

21963654 is a wasteful number, since it uses less digits than its factorization.

21963654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220211 (or 1220208 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 21963654 is about 4686.5396616267. The cubic root of 21963654 is about 280.0495405540.

The spelling of 21963654 in words is "twenty-one million, nine hundred sixty-three thousand, six hundred fifty-four".