21150546 has 16 divisors (see below), whose sum is σ = 42347424. Its totient is φ = 7042464.

The previous prime is 21150523. The next prime is 21150607. The reversal of 21150546 is 64505112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7710 + ... + 10086.

It is an arithmetic number, because the mean of its divisors is an integer number (2646714).

Almost surely, 2^21150546 is an apocalyptic number.

21150546 is an abundant number, since it is smaller than the sum of its proper divisors (21196878).

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

21150546 is a wasteful number, since it uses less digits than its factorization.

21150546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 21150546 is about 4598.9722764983. The cubic root of 21150546 is about 276.5501262363.

Adding to 21150546 its reverse (64505112), we get a palindrome (85655658).

The spelling of 21150546 in words is "twenty-one million, one hundred fifty thousand, five hundred forty-six".