21926550 has 48 divisors (see below), whose sum is σ = 54853632. Its totient is φ = 5796000.

The previous prime is 21926519. The next prime is 21926561. The reversal of 21926550 is 5562912.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18475 + ... + 19625.

It is an arithmetic number, because the mean of its divisors is an integer number (1142784).

Almost surely, 2^21926550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21926550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27426816).

21926550 is an abundant number, since it is smaller than the sum of its proper divisors (32927082).

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

21926550 is a wasteful number, since it uses less digits than its factorization.

21926550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293 (or 1288 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 21926550 is about 4682.5794173724. The cubic root of 21926550 is about 279.8917523747.

The spelling of 21926550 in words is "twenty-one million, nine hundred twenty-six thousand, five hundred fifty".