21839642954 has 8 divisors (see below), whose sum is σ = 32760766308. Its totient is φ = 10919387520.

The previous prime is 21839642953. The next prime is 21839642999. The reversal of 21839642954 is 45924693812.

It can be written as a sum of positive squares in 2 ways, for example, as 21601650625 + 237992329 = 146975^2 + 15427^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21839642954² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21839642896 and 21839642905.

It is not an unprimeable number, because it can be changed into a prime (21839642953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149927 + ... + 257210.

Almost surely, 2^21839642954 is an apocalyptic number.

21839642954 is a deficient number, since it is larger than the sum of its proper divisors (10921123354).

21839642954 is a wasteful number, since it uses less digits than its factorization.

21839642954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433960.

The product of its digits is 3732480, while the sum is 53.

The spelling of 21839642954 in words is "twenty-one billion, eight hundred thirty-nine million, six hundred forty-two thousand, nine hundred fifty-four".