21192764 has 6 divisors (see below), whose sum is σ = 37087344. Its totient is φ = 10596380.

The previous prime is 21192763. The next prime is 21192791. The reversal of 21192764 is 46729112.

It is a happy number.

It is a super-3 number, since 3×21192764³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21192764.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21192763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2649092 + ... + 2649099.

It is an arithmetic number, because the mean of its divisors is an integer number (6181224).

Almost surely, 2^21192764 is an apocalyptic number.

It is an amenable number.

21192764 is a deficient number, since it is larger than the sum of its proper divisors (15894580).

21192764 is a wasteful number, since it uses less digits than its factorization.

21192764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5298195 (or 5298193 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 21192764 is about 4603.5599268392. The cubic root of 21192764 is about 276.7340085424.

The spelling of 21192764 in words is "twenty-one million, one hundred ninety-two thousand, seven hundred sixty-four".