7721477181340 has 96 divisors (see below), whose sum is σ = 18829821810240. Its totient is φ = 2635076966400.

The previous prime is 7721477181337. The next prime is 7721477181349. The reversal of 7721477181340 is 431817741277.

It is a super-2 number, since 2×7721477181340² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721477181349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18859071 + ... + 19264150.

It is an arithmetic number, because the mean of its divisors is an integer number (196143977190).

Almost surely, 2^{7721477181340} is an apocalyptic number.

It is an amenable number.

7721477181340 is an abundant number, since it is smaller than the sum of its proper divisors (11108344628900).

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

7721477181340 is a wasteful number, since it uses less digits than its factorization.

7721477181340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38123303 (or 38123301 counting only the distinct ones).

The product of its (nonzero) digits is 1843968, while the sum is 52.

The spelling of 7721477181340 in words is "seven trillion, seven hundred twenty-one billion, four hundred seventy-seven million, one hundred eighty-one thousand, three hundred forty".