21736967979384 has 240 divisors, whose sum is σ = 70894153437120. Its totient is φ = 6010220079360.

The previous prime is 21736967979361. The next prime is 21736967979409. The reversal of 21736967979384 is 48397976963712.

It is a happy number.

21736967979384 is a `hidden beast` number, since 2 + 1 + 7 + 369 + 6 + 7 + 97 + 93 + 84 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3330964 + ... + 7387100.

It is an arithmetic number, because the mean of its divisors is an integer number (295392305988).

Almost surely, 2^{21736967979384} is an apocalyptic number.

21736967979384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21736967979384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35447076718560).

21736967979384 is an abundant number, since it is smaller than the sum of its proper divisors (49157185457736).

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

21736967979384 is a wasteful number, since it uses less digits than its factorization.

21736967979384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056208 (or 4056180 counting only the distinct ones).

The product of its digits is 5184974592, while the sum is 81.

The spelling of 21736967979384 in words is "twenty-one trillion, seven hundred thirty-six billion, nine hundred sixty-seven million, nine hundred seventy-nine thousand, three hundred eighty-four".