21143952 has 30 divisors (see below), whose sum is σ = 59174102. Its totient is φ = 7047936.

The previous prime is 21143951. The next prime is 21143977. The reversal of 21143952 is 25934112.

It can be written as a sum of positive squares in only one way, i.e., 21123216 + 20736 = 4596^2 + 144^2 .

It is not an unprimeable number, because it can be changed into a prime (21143951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73273 + ... + 73560.

Almost surely, 2^21143952 is an apocalyptic number.

It is an amenable number.

21143952 is an abundant number, since it is smaller than the sum of its proper divisors (38030150).

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

21143952 is a wasteful number, since it uses less digits than its factorization.

21143952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146847 (or 146838 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21143952 is about 4598.2553213148. The cubic root of 21143952 is about 276.5213836989.

The spelling of 21143952 in words is "twenty-one million, one hundred forty-three thousand, nine hundred fifty-two".