21552146 has 32 divisors (see below), whose sum is σ = 40521600. Its totient is φ = 8352000.

The previous prime is 21552143. The next prime is 21552197. The reversal of 21552146 is 64125512.

It is not an unprimeable number, because it can be changed into a prime (21552143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53546 + ... + 53946.

It is an arithmetic number, because the mean of its divisors is an integer number (1266300).

Almost surely, 2^21552146 is an apocalyptic number.

21552146 is a deficient number, since it is larger than the sum of its proper divisors (18969454).

21552146 is a wasteful number, since it uses less digits than its factorization.

21552146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770.

The product of its digits is 2400, while the sum is 26.

The square root of 21552146 is about 4642.4288901393. The cubic root of 21552146 is about 278.2895125852.

Adding to 21552146 its reverse (64125512), we get a palindrome (85677658).

The spelling of 21552146 in words is "twenty-one million, five hundred fifty-two thousand, one hundred forty-six".