21479837570 has 16 divisors (see below), whose sum is σ = 39018422520. Its totient is φ = 8513109504.

The previous prime is 21479837531. The next prime is 21479837579. The reversal of 21479837570 is 7573897412.

It can be written as a sum of positive squares in 4 ways, for example, as 20006122249 + 1473715321 = 141443^2 + 38389^2 .

It is a super-2 number, since 2×21479837570² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21479837579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9852047 + ... + 9854226.

Almost surely, 2^21479837570 is an apocalyptic number.

21479837570 is a deficient number, since it is larger than the sum of its proper divisors (17538584950).

21479837570 is a wasteful number, since it uses less digits than its factorization.

21479837570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19706389.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 21479837570 in words is "twenty-one billion, four hundred seventy-nine million, eight hundred thirty-seven thousand, five hundred seventy".