21570150 has 48 divisors (see below), whose sum is σ = 61138944. Its totient is φ = 4930080.

The previous prime is 21570139. The next prime is 21570163. The reversal of 21570150 is 5107512.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 9222 + ... + 11321.

It is an arithmetic number, because the mean of its divisors is an integer number (1273728).

Almost surely, 2^21570150 is an apocalyptic number.

21570150 is an abundant number, since it is smaller than the sum of its proper divisors (39568794).

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

21570150 is a wasteful number, since it uses less digits than its factorization.

21570150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20565 (or 20560 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 21570150 is about 4644.3675565140. The cubic root of 21570150 is about 278.3669825175.

Adding to 21570150 its reverse (5107512), we get a palindrome (26677662).

The spelling of 21570150 in words is "twenty-one million, five hundred seventy thousand, one hundred fifty".