21366277632 has 320 divisors, whose sum is σ = 76091558400. Its totient is φ = 5782855680.

The previous prime is 21366277609. The next prime is 21366277633. The reversal of 21366277632 is 23677266312.

21366277632 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 6 + 2 + 7 + 7 + 632 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366277633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1832782 + ... + 1844402.

It is an arithmetic number, because the mean of its divisors is an integer number (237786120).

Almost surely, 2^21366277632 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 21366277632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38045779200).

21366277632 is an abundant number, since it is smaller than the sum of its proper divisors (54725280768).

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

21366277632 is a wasteful number, since it uses less digits than its factorization.

21366277632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11674 (or 11652 counting only the distinct ones).

The product of its digits is 762048, while the sum is 45.

The spelling of 21366277632 in words is "twenty-one billion, three hundred sixty-six million, two hundred seventy-seven thousand, six hundred thirty-two".