1921721466 has 32 divisors (see below), whose sum is σ = 4511226240. Its totient is φ = 534223296.

The previous prime is 1921721449. The next prime is 1921721519. The reversal of 1921721466 is 6641271291.

It is a super-3 number, since 3×1921721466³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616761 + ... + 619868.

It is an arithmetic number, because the mean of its divisors is an integer number (140975820).

Almost surely, 2^1921721466 is an apocalyptic number.

1921721466 is an abundant number, since it is smaller than the sum of its proper divisors (2589504774).

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

1921721466 is a wasteful number, since it uses less digits than its factorization.

1921721466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236678.

The product of its digits is 36288, while the sum is 39.

The square root of 1921721466 is about 43837.4436526584. The cubic root of 1921721466 is about 1243.2643494147.

The spelling of 1921721466 in words is "one billion, nine hundred twenty-one million, seven hundred twenty-one thousand, four hundred sixty-six".