21257382514 has 16 divisors (see below), whose sum is σ = 33567372000. Its totient is φ = 10068361344.

The previous prime is 21257382491. The next prime is 21257382547. The reversal of 21257382514 is 41528375212.

It is a super-2 number, since 2×21257382514² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576789 + ... + 612535.

It is an arithmetic number, because the mean of its divisors is an integer number (2097960750).

Almost surely, 2^21257382514 is an apocalyptic number.

21257382514 is a deficient number, since it is larger than the sum of its proper divisors (12309989486).

21257382514 is a wasteful number, since it uses less digits than its factorization.

21257382514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51417.

The product of its digits is 134400, while the sum is 40.

The spelling of 21257382514 in words is "twenty-one billion, two hundred fifty-seven million, three hundred eighty-two thousand, five hundred fourteen".