21263181076 has 24 divisors (see below), whose sum is σ = 38022074496. Its totient is φ = 10399967040.

The previous prime is 21263181073. The next prime is 21263181169. The reversal of 21263181076 is 67018136212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263181073) 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, 345096 + ... + 402016.

It is an arithmetic number, because the mean of its divisors is an integer number (1584253104).

Almost surely, 2^21263181076 is an apocalyptic number.

It is an amenable number.

21263181076 is a deficient number, since it is larger than the sum of its proper divisors (16758893420).

21263181076 is a wasteful number, since it uses less digits than its factorization.

21263181076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58959 (or 58957 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 21263181076 in words is "twenty-one billion, two hundred sixty-three million, one hundred eighty-one thousand, seventy-six".