21497079412 has 12 divisors (see below), whose sum is σ = 37628702496. Its totient is φ = 10746021560.

The previous prime is 21497079403. The next prime is 21497079413.

It is a happy number.

21497079412 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21497079413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610264 + ... + 644527.

It is an arithmetic number, because the mean of its divisors is an integer number (3135725208).

Almost surely, 2^21497079412 is an apocalyptic number.

It is an amenable number.

21497079412 is a deficient number, since it is larger than the sum of its proper divisors (16131623084).

21497079412 is a wasteful number, since it uses less digits than its factorization.

21497079412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259078 (or 1259076 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 21497079412 in words is "twenty-one billion, four hundred ninety-seven million, seventy-nine thousand, four hundred twelve".