21619411380 has 192 divisors, whose sum is σ = 78129999360. Its totient is φ = 4860518400.

The previous prime is 21619411339. The next prime is 21619411409. The reversal of 21619411380 is 8311491612.

21619411380 is a `hidden beast` number, since 2 + 1 + 619 + 4 + 1 + 1 + 38 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 183700 + ... + 277460.

It is an arithmetic number, because the mean of its divisors is an integer number (406927080).

Almost surely, 2^21619411380 is an apocalyptic number.

21619411380 is a gapful number since it is divisible by the number (20) 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 21619411380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39064999680).

21619411380 is an abundant number, since it is smaller than the sum of its proper divisors (56510587980).

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

21619411380 is a wasteful number, since it uses less digits than its factorization.

21619411380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93847 (or 93839 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 21619411380 in words is "twenty-one billion, six hundred nineteen million, four hundred eleven thousand, three hundred eighty".