21695562 has 48 divisors (see below), whose sum is σ = 54025920. Its totient is φ = 6163776.

The previous prime is 21695561. The next prime is 21695563. The reversal of 21695562 is 26559612.

21695562 is a `hidden beast` number, since 2 + 1 + 6 + 95 + 562 = 666.

It is an interprime number because it is at equal distance from previous prime (21695561) and next prime (21695563).

It is not an unprimeable number, because it can be changed into a prime (21695561) 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, 28989 + ... + 29727.

It is an arithmetic number, because the mean of its divisors is an integer number (1125540).

Almost surely, 2^21695562 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21695562, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27012960).

21695562 is an abundant number, since it is smaller than the sum of its proper divisors (32330358).

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

21695562 is a wasteful number, since it uses less digits than its factorization.

21695562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 984 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 21695562 is about 4657.8495037946. The cubic root of 21695562 is about 278.9054290798.

The spelling of 21695562 in words is "twenty-one million, six hundred ninety-five thousand, five hundred sixty-two".