21422088 has 48 divisors (see below), whose sum is σ = 58553820. Its totient is φ = 7074816.

The previous prime is 21422077. The next prime is 21422099. The reversal of 21422088 is 88022412.

It is an interprime number because it is at equal distance from previous prime (21422077) and next prime (21422099).

It can be written as a sum of positive squares in 2 ways, for example, as 16305444 + 5116644 = 4038^2 + 2262^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6820 + ... + 9452.

Almost surely, 2^21422088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21422088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29276910).

21422088 is an abundant number, since it is smaller than the sum of its proper divisors (37131732).

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

21422088 is a wasteful number, since it uses less digits than its factorization.

21422088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758 (or 2751 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 21422088 is about 4628.4001555613. The cubic root of 21422088 is about 277.7285966381.

The spelling of 21422088 in words is "twenty-one million, four hundred twenty-two thousand, eighty-eight".