21354152 has 8 divisors (see below), whose sum is σ = 40039050. Its totient is φ = 10677072.

The previous prime is 21354139. The next prime is 21354167. The reversal of 21354152 is 25145312.

It can be written as a sum of positive squares in only one way, i.e., 19061956 + 2292196 = 4366^2 + 1514^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334627 + ... + 1334642.

Almost surely, 2^21354152 is an apocalyptic number.

It is an amenable number.

21354152 is a deficient number, since it is larger than the sum of its proper divisors (18684898).

21354152 is a wasteful number, since it uses less digits than its factorization.

21354152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669275 (or 2669271 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 21354152 is about 4621.0552907318. The cubic root of 21354152 is about 277.4346982669.

Adding to 21354152 its reverse (25145312), we get a palindrome (46499464).

The spelling of 21354152 in words is "twenty-one million, three hundred fifty-four thousand, one hundred fifty-two".