21442724935641 has 9 divisors (see below), whose sum is σ = 30972844973109. Its totient is φ = 14295140695836.

The previous prime is 21442724935613. The next prime is 21442724935649. The reversal of 21442724935641 is 14653942724412.

The square root of 21442724935641 is 4630629.

It is a perfect power (a square), and thus also a powerful number.

21442724935641 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 2 + 7 + 249 + 356 + 41 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 21442724935641 - 2⁵ = 21442724935609 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21442724935649) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13120116 + ... + 14663658.

Almost surely, 2^{21442724935641} is an apocalyptic number.

21442724935641 is the 4630629-th square number.

21442724935641 is the 2315315-th centered octagonal number.

It is an amenable number.

21442724935641 is a deficient number, since it is larger than the sum of its proper divisors (9530120037468).

21442724935641 is an frugal number, since it uses more digits than its factorization.

21442724935641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087092 (or 1543546 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 54.

The spelling of 21442724935641 in words is "twenty-one trillion, four hundred forty-two billion, seven hundred twenty-four million, nine hundred thirty-five thousand, six hundred forty-one".