21955050 has 144 divisors (see below), whose sum is σ = 66349920. Its totient is φ = 5365440.

The previous prime is 21955039. The next prime is 21955067. The reversal of 21955050 is 5055912.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 157881 + ... + 158019.

Almost surely, 2^21955050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21955050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33174960).

21955050 is an abundant number, since it is smaller than the sum of its proper divisors (44394870).

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

21955050 is a wasteful number, since it uses less digits than its factorization.

21955050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 21955050 is about 4685.6216236482. The cubic root of 21955050 is about 280.0129670865.

The spelling of 21955050 in words is "twenty-one million, nine hundred fifty-five thousand, fifty".