21460412516 has 12 divisors (see below), whose sum is σ = 37578901500. Its totient is φ = 10723583520.

The previous prime is 21460412483. The next prime is 21460412527. The reversal of 21460412516 is 61521406412.

It can be written as a sum of positive squares in 2 ways, for example, as 12185952100 + 9274460416 = 110390^2 + 96304^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1648391 + ... + 1661358.

It is an arithmetic number, because the mean of its divisors is an integer number (3131575125).

Almost surely, 2^21460412516 is an apocalyptic number.

It is an amenable number.

21460412516 is a deficient number, since it is larger than the sum of its proper divisors (16118488984).

21460412516 is a wasteful number, since it uses less digits than its factorization.

21460412516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311374 (or 3311372 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 21460412516 its reverse (61521406412), we get a palindrome (82981818928).

The spelling of 21460412516 in words is "twenty-one billion, four hundred sixty million, four hundred twelve thousand, five hundred sixteen".