21418153718 has 16 divisors (see below), whose sum is σ = 35072511936. Its totient is φ = 9749885760.

The previous prime is 21418153697. The next prime is 21418153723. The reversal of 21418153718 is 81735181412.

It is a congruent number.

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, 5640398 + ... + 5644193.

It is an arithmetic number, because the mean of its divisors is an integer number (2192031996).

Almost surely, 2^21418153718 is an apocalyptic number.

21418153718 is a deficient number, since it is larger than the sum of its proper divisors (13654358218).

21418153718 is a wasteful number, since it uses less digits than its factorization.

21418153718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11284679.

The product of its digits is 53760, while the sum is 41.

The spelling of 21418153718 in words is "twenty-one billion, four hundred eighteen million, one hundred fifty-three thousand, seven hundred eighteen".