21942531439 has 8 divisors (see below), whose sum is σ = 21971250000. Its totient is φ = 21913834752.

The previous prime is 21942531307. The next prime is 21942531509. The reversal of 21942531439 is 93413524912.

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

It is a cyclic number.

It is not a de Polignac number, because 21942531439 - 2²¹ = 21940434287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21942531395 and 21942531404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21942531739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2922312 + ... + 2929810.

It is an arithmetic number, because the mean of its divisors is an integer number (2746406250).

Almost surely, 2^21942531439 is an apocalyptic number.

21942531439 is a deficient number, since it is larger than the sum of its proper divisors (28718561).

21942531439 is a wasteful number, since it uses less digits than its factorization.

21942531439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10937.

The product of its digits is 233280, while the sum is 43.

The spelling of 21942531439 in words is "twenty-one billion, nine hundred forty-two million, five hundred thirty-one thousand, four hundred thirty-nine".