21534855676 has 12 divisors (see below), whose sum is σ = 37688742000. Its totient is φ = 10766643680.

The previous prime is 21534855649. The next prime is 21534855691. The reversal of 21534855676 is 67655843512.

It is a super-2 number, since 2×21534855676² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131920 + ... + 245911.

It is an arithmetic number, because the mean of its divisors is an integer number (3140728500).

Almost surely, 2^21534855676 is an apocalyptic number.

It is an amenable number.

21534855676 is a deficient number, since it is larger than the sum of its proper divisors (16153886324).

21534855676 is a wasteful number, since it uses less digits than its factorization.

21534855676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392084 (or 392082 counting only the distinct ones).

The product of its digits is 6048000, while the sum is 52.

The spelling of 21534855676 in words is "twenty-one billion, five hundred thirty-four million, eight hundred fifty-five thousand, six hundred seventy-six".