21197470224 has 80 divisors (see below), whose sum is σ = 62602342400. Its totient is φ = 6054549120.

The previous prime is 21197470223. The next prime is 21197470241. The reversal of 21197470224 is 42207479112.

It is a super-2 number, since 2×21197470224² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21197470223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1369569 + ... + 1384959.

It is an arithmetic number, because the mean of its divisors is an integer number (782529280).

Almost surely, 2^21197470224 is an apocalyptic number.

21197470224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21197470224 is an abundant number, since it is smaller than the sum of its proper divisors (41404872176).

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

21197470224 is a wasteful number, since it uses less digits than its factorization.

21197470224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19508 (or 19502 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The spelling of 21197470224 in words is "twenty-one billion, one hundred ninety-seven million, four hundred seventy thousand, two hundred twenty-four".