21532667 has 16 divisors (see below), whose sum is σ = 24131520. Its totient is φ = 19084800.

The previous prime is 21532663. The next prime is 21532697. The reversal of 21532667 is 76623512.

It is not a de Polignac number, because 21532667 - 2² = 21532663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21532663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37559 + ... + 38127.

It is an arithmetic number, because the mean of its divisors is an integer number (1508220).

Almost surely, 2^21532667 is an apocalyptic number.

21532667 is a deficient number, since it is larger than the sum of its proper divisors (2598853).

21532667 is a wasteful number, since it uses less digits than its factorization.

21532667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694.

The product of its digits is 15120, while the sum is 32.

The square root of 21532667 is about 4640.3304839203. The cubic root of 21532667 is about 278.2056472266.

The spelling of 21532667 in words is "twenty-one million, five hundred thirty-two thousand, six hundred sixty-seven".