21361743516 has 48 divisors (see below), whose sum is σ = 52805281536. Its totient is φ = 6698014464.

The previous prime is 21361743509. The next prime is 21361743523. The reversal of 21361743516 is 61534716312.

It is an interprime number because it is at equal distance from previous prime (21361743509) and next prime (21361743523).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352825 + ... + 408911.

It is an arithmetic number, because the mean of its divisors is an integer number (1100110032).

Almost surely, 2^21361743516 is an apocalyptic number.

It is an amenable number.

21361743516 is an abundant number, since it is smaller than the sum of its proper divisors (31443538020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21361743516 is a wasteful number, since it uses less digits than its factorization.

21361743516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57978 (or 57976 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The spelling of 21361743516 in words is "twenty-one billion, three hundred sixty-one million, seven hundred forty-three thousand, five hundred sixteen".