21879537673 has 12 divisors (see below), whose sum is σ = 25512474960. Its totient is φ = 18709113192.

The previous prime is 21879537653. The next prime is 21879537677. The reversal of 21879537673 is 37673597812.

It is a happy number.

It is not a de Polignac number, because 21879537673 - 2⁹ = 21879537161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21879537677) 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, 512311 + ... + 553372.

It is an arithmetic number, because the mean of its divisors is an integer number (2126039580).

Almost surely, 2^21879537673 is an apocalyptic number.

It is an amenable number.

21879537673 is a deficient number, since it is larger than the sum of its proper divisors (3632937287).

21879537673 is a wasteful number, since it uses less digits than its factorization.

21879537673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066116 (or 1066109 counting only the distinct ones).

The product of its digits is 13335840, while the sum is 58.

The spelling of 21879537673 in words is "twenty-one billion, eight hundred seventy-nine million, five hundred thirty-seven thousand, six hundred seventy-three".