21396052 has 12 divisors (see below), whose sum is σ = 39413920. Its totient is φ = 10134936.

The previous prime is 21396043. The next prime is 21396059. The reversal of 21396052 is 25069312.

It is a self number, because there is not a number n which added to its sum of digits gives 21396052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21396059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140688 + ... + 140839.

Almost surely, 2^21396052 is an apocalyptic number.

It is an amenable number.

21396052 is a deficient number, since it is larger than the sum of its proper divisors (18017868).

21396052 is a wasteful number, since it uses less digits than its factorization.

21396052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281550 (or 281548 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 21396052 is about 4625.5866654944. The cubic root of 21396052 is about 277.6160356656.

The spelling of 21396052 in words is "twenty-one million, three hundred ninety-six thousand, fifty-two".