24219981 has 12 divisors (see below), whose sum is σ = 35407008. Its totient is φ = 15951624.

The previous prime is 24219977. The next prime is 24219991. The reversal of 24219981 is 18991242.

It is not a de Polignac number, because 24219981 - 2² = 24219977 is a prime.

It is a super-2 number, since 2×24219981² = 1173214959280722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24219931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15465 + ... + 16958.

It is an arithmetic number, because the mean of its divisors is an integer number (2950584).

Almost surely, 2^24219981 is an apocalyptic number.

It is an amenable number.

24219981 is a deficient number, since it is larger than the sum of its proper divisors (11187027).

24219981 is a wasteful number, since it uses less digits than its factorization.

24219981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32512 (or 32509 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 24219981 is about 4921.3799893932. The cubic root of 24219981 is about 289.3285336839.

It can be divided in two parts, 24219 and 981, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 24219981 in words is "twenty-four million, two hundred nineteen thousand, nine hundred eighty-one".