21455950 has 12 divisors (see below), whose sum is σ = 39908160. Its totient is φ = 8582360.

The previous prime is 21455947. The next prime is 21455953. The reversal of 21455950 is 5955412.

It is an interprime number because it is at equal distance from previous prime (21455947) and next prime (21455953).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455953) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214510 + ... + 214609.

It is an arithmetic number, because the mean of its divisors is an integer number (3325680).

Almost surely, 2^21455950 is an apocalyptic number.

21455950 is a deficient number, since it is larger than the sum of its proper divisors (18452210).

21455950 is a wasteful number, since it uses less digits than its factorization.

21455950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429131 (or 429126 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 21455950 is about 4632.0567785812. The cubic root of 21455950 is about 277.8748552547.

The spelling of 21455950 in words is "twenty-one million, four hundred fifty-five thousand, nine hundred fifty".