21394459710 has 288 divisors, whose sum is σ = 65742243840. Its totient is φ = 4781887488.

The previous prime is 21394459687. The next prime is 21394459721. The reversal of 21394459710 is 1795449312.

21394459710 is a `hidden beast` number, since 2 + 1 + 3 + 9 + 44 + 597 + 10 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 16726851 + ... + 16728129.

It is an arithmetic number, because the mean of its divisors is an integer number (228271680).

Almost surely, 2^21394459710 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21394459710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32871121920).

21394459710 is an abundant number, since it is smaller than the sum of its proper divisors (44347784130).

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

21394459710 is a wasteful number, since it uses less digits than its factorization.

21394459710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380 (or 1348 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 21394459710 in words is "twenty-one billion, three hundred ninety-four million, four hundred fifty-nine thousand, seven hundred ten".