21348766 has 4 divisors (see below), whose sum is σ = 32023152. Its totient is φ = 10674382.

The previous prime is 21348749. The next prime is 21348773. The reversal of 21348766 is 66784312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5337190 + ... + 5337193.

It is an arithmetic number, because the mean of its divisors is an integer number (8005788).

Almost surely, 2^21348766 is an apocalyptic number.

21348766 is a deficient number, since it is larger than the sum of its proper divisors (10674386).

21348766 is a wasteful number, since it uses less digits than its factorization.

21348766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10674385.

The product of its digits is 48384, while the sum is 37.

The square root of 21348766 is about 4620.4724866619. The cubic root of 21348766 is about 277.4113712041.

The spelling of 21348766 in words is "twenty-one million, three hundred forty-eight thousand, seven hundred sixty-six".