21532719 has 16 divisors (see below), whose sum is σ = 32547200. Its totient is φ = 12553056.

The previous prime is 21532717. The next prime is 21532733. The reversal of 21532719 is 91723512.

It is not a de Polignac number, because 21532719 - 2¹ = 21532717 is a prime.

It is a super-2 number, since 2×21532719² = 927315975065922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532717) 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, 13789 + ... + 15270.

It is an arithmetic number, because the mean of its divisors is an integer number (2034200).

Almost surely, 2^21532719 is an apocalyptic number.

21532719 is a deficient number, since it is larger than the sum of its proper divisors (11014481).

21532719 is a wasteful number, since it uses less digits than its factorization.

21532719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29094.

The product of its digits is 3780, while the sum is 30.

The square root of 21532719 is about 4640.3360869661. The cubic root of 21532719 is about 278.2058711760.

The spelling of 21532719 in words is "twenty-one million, five hundred thirty-two thousand, seven hundred nineteen".