21373769464 has 8 divisors (see below), whose sum is σ = 40075817760. Its totient is φ = 10686884728.

The previous prime is 21373769449. The next prime is 21373769479. The reversal of 21373769464 is 46496737312.

It is an interprime number because it is at equal distance from previous prime (21373769449) and next prime (21373769479).

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21373769464² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1335860584 + ... + 1335860599.

It is an arithmetic number, because the mean of its divisors is an integer number (5009477220).

Almost surely, 2^21373769464 is an apocalyptic number.

It is an amenable number.

21373769464 is a deficient number, since it is larger than the sum of its proper divisors (18702048296).

21373769464 is a wasteful number, since it uses less digits than its factorization.

21373769464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671721189 (or 2671721185 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 52.

The spelling of 21373769464 in words is "twenty-one billion, three hundred seventy-three million, seven hundred sixty-nine thousand, four hundred sixty-four".