21479497468 has 36 divisors (see below), whose sum is σ = 44495208520. Its totient is φ = 9012373920.

The previous prime is 21479497463. The next prime is 21479497493. The reversal of 21479497468 is 86479497412.

It is a super-2 number, since 2×21479497468² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21479497463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1700598 + ... + 1713181.

Almost surely, 2^21479497468 is an apocalyptic number.

It is an amenable number.

21479497468 is an abundant number, since it is smaller than the sum of its proper divisors (23015711052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21479497468 is a wasteful number, since it uses less digits than its factorization.

21479497468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3413818 (or 3413805 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 61.

The spelling of 21479497468 in words is "twenty-one billion, four hundred seventy-nine million, four hundred ninety-seven thousand, four hundred sixty-eight".