21719483730 has 192 divisors, whose sum is σ = 69730502400. Its totient is φ = 4672313856.

The previous prime is 21719483729. The next prime is 21719483759. The reversal of 21719483730 is 3738491712.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 504097 + ... + 545483.

It is an arithmetic number, because the mean of its divisors is an integer number (363179700).

Almost surely, 2^21719483730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21719483730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34865251200).

21719483730 is an abundant number, since it is smaller than the sum of its proper divisors (48011018670).

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

21719483730 is a wasteful number, since it uses less digits than its factorization.

21719483730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41438 (or 41421 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 21719483730 in words is "twenty-one billion, seven hundred nineteen million, four hundred eighty-three thousand, seven hundred thirty".