21360766 has 48 divisors (see below), whose sum is σ = 39455856. Its totient is φ = 8636544.

The previous prime is 21360761. The next prime is 21360799. The reversal of 21360766 is 66706312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21360761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155850 + ... + 155986.

It is an arithmetic number, because the mean of its divisors is an integer number (821997).

Almost surely, 2^21360766 is an apocalyptic number.

21360766 is a deficient number, since it is larger than the sum of its proper divisors (18095090).

21360766 is a wasteful number, since it uses less digits than its factorization.

21360766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 21360766 is about 4621.7708727283. The cubic root of 21360766 is about 277.4633385001.

The spelling of 21360766 in words is "twenty-one million, three hundred sixty thousand, seven hundred sixty-six".