21081460740 has 96 divisors (see below), whose sum is σ = 59720177664. Its totient is φ = 5556195840.

The previous prime is 21081460739. The next prime is 21081460787. The reversal of 21081460740 is 4706418012.

It is a super-2 number, since 2×21081460740² (a number of 21 digits) contains 22 as substring.

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, 1793362 + ... + 1805078.

It is an arithmetic number, because the mean of its divisors is an integer number (622085184).

Almost surely, 2^21081460740 is an apocalyptic number.

21081460740 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 21081460740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29860088832).

21081460740 is an abundant number, since it is smaller than the sum of its proper divisors (38638716924).

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

21081460740 is a wasteful number, since it uses less digits than its factorization.

21081460740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12077 (or 12075 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

Adding to 21081460740 its reverse (4706418012), we get a palindrome (25787878752).

The spelling of 21081460740 in words is "twenty-one billion, eighty-one million, four hundred sixty thousand, seven hundred forty".