21261013414 has 12 divisors (see below), whose sum is σ = 33658364484. Its totient is φ = 10071006012.

The previous prime is 21261013391. The next prime is 21261013451. The reversal of 21261013414 is 41431016212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14722972 + ... + 14724415.

It is an arithmetic number, because the mean of its divisors is an integer number (2804863707).

Almost surely, 2^21261013414 is an apocalyptic number.

21261013414 is a deficient number, since it is larger than the sum of its proper divisors (12397351070).

21261013414 is a wasteful number, since it uses less digits than its factorization.

21261013414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29447427 (or 29447408 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 21261013414 its reverse (41431016212), we get a palindrome (62692029626).

The spelling of 21261013414 in words is "twenty-one billion, two hundred sixty-one million, thirteen thousand, four hundred fourteen".