21361742676 has 72 divisors (see below), whose sum is σ = 54853116864. Its totient is φ = 7008197760.

The previous prime is 21361742657. The next prime is 21361742681. The reversal of 21361742676 is 67624716312.

21361742676 is a `hidden beast` number, since 2 + 1 + 3 + 617 + 4 + 26 + 7 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1271491 + ... + 1288181.

Almost surely, 2^21361742676 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21361742676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27426558432).

21361742676 is an abundant number, since it is smaller than the sum of its proper divisors (33491374188).

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

21361742676 is a wasteful number, since it uses less digits than its factorization.

21361742676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17261 (or 17256 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The spelling of 21361742676 in words is "twenty-one billion, three hundred sixty-one million, seven hundred forty-two thousand, six hundred seventy-six".