21481737340 has 96 divisors (see below), whose sum is σ = 53952998400. Its totient is φ = 7024613376.

The previous prime is 21481737293. The next prime is 21481737367. The reversal of 21481737340 is 4373718412.

It is a super-2 number, since 2×21481737340² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21481737293 and 21481737302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1127211 + ... + 1146109.

It is an arithmetic number, because the mean of its divisors is an integer number (562010400).

Almost surely, 2^21481737340 is an apocalyptic number.

21481737340 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 21481737340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26976499200).

21481737340 is an abundant number, since it is smaller than the sum of its proper divisors (32471261060).

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

21481737340 is a wasteful number, since it uses less digits than its factorization.

21481737340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19291 (or 19289 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 21481737340 in words is "twenty-one billion, four hundred eighty-one million, seven hundred thirty-seven thousand, three hundred forty".