21500950 has 12 divisors (see below), whose sum is σ = 39991860. Its totient is φ = 8600360.

The previous prime is 21500939. The next prime is 21500953. The reversal of 21500950 is 5900512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500953) 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, 214960 + ... + 215059.

It is an arithmetic number, because the mean of its divisors is an integer number (3332655).

Almost surely, 2^21500950 is an apocalyptic number.

21500950 is a deficient number, since it is larger than the sum of its proper divisors (18490910).

21500950 is a wasteful number, since it uses less digits than its factorization.

21500950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430031 (or 430026 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 21500950 is about 4636.9116877508. The cubic root of 21500950 is about 278.0689837951.

The spelling of 21500950 in words is "twenty-one million, five hundred thousand, nine hundred fifty".