21698809083 has 48 divisors (see below), whose sum is σ = 36769075200. Its totient is φ = 12073578048.

The previous prime is 21698809079. The next prime is 21698809091. The reversal of 21698809083 is 38090889612.

It is a happy number.

It is not a de Polignac number, because 21698809083 - 2² = 21698809079 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21698809003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 564718 + ... + 601916.

It is an arithmetic number, because the mean of its divisors is an integer number (766022400).

Almost surely, 2^21698809083 is an apocalyptic number.

21698809083 is a deficient number, since it is larger than the sum of its proper divisors (15070266117).

21698809083 is a wasteful number, since it uses less digits than its factorization.

21698809083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37456 (or 37453 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 21698809083 in words is "twenty-one billion, six hundred ninety-eight million, eight hundred nine thousand, eighty-three".