21010140513 has 24 divisors (see below), whose sum is σ = 30858835176. Its totient is φ = 13771180800.

The previous prime is 21010140499. The next prime is 21010140551. The reversal of 21010140513 is 31504101012.

21010140513 is a `hidden beast` number, since 2 + 1 + 0 + 10 + 140 + 513 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 84492864 + 20925647649 = 9192^2 + 144657^2 .

It is not a de Polignac number, because 21010140513 - 2⁴ = 21010140497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010140113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1517683 + ... + 1531463.

It is an arithmetic number, because the mean of its divisors is an integer number (1285784799).

Almost surely, 2^21010140513 is an apocalyptic number.

It is an amenable number.

21010140513 is a deficient number, since it is larger than the sum of its proper divisors (9848694663).

21010140513 is a wasteful number, since it uses less digits than its factorization.

21010140513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16625 (or 16622 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 21010140513 its reverse (31504101012), we get a palindrome (52514241525).

The spelling of 21010140513 in words is "twenty-one billion, ten million, one hundred forty thousand, five hundred thirteen".