21500022150 has 36 divisors (see below), whose sum is σ = 57763394052. Its totient is φ = 5733339120.

The previous prime is 21500022143. The next prime is 21500022157. The reversal of 21500022150 is 5122000512.

It is an interprime number because it is at equal distance from previous prime (21500022143) and next prime (21500022157).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500022157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23888464 + ... + 23889363.

Almost surely, 2^21500022150 is an apocalyptic number.

21500022150 is an abundant number, since it is smaller than the sum of its proper divisors (36263371902).

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

21500022150 is a wasteful number, since it uses less digits than its factorization.

21500022150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47777845 (or 47777837 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

Adding to 21500022150 its reverse (5122000512), we get a palindrome (26622022662).

The spelling of 21500022150 in words is "twenty-one billion, five hundred million, twenty-two thousand, one hundred fifty".