1421956081764 has 81 divisors (see below), whose sum is σ = 3757896343929. Its totient is φ = 453324833280.

The previous prime is 1421956081759. The next prime is 1421956081813. The reversal of 1421956081764 is 4671806591241.

The square root of 1421956081764 is 1192458.

It is a perfect power (a square), and thus also a powerful number.

1421956081764 is a `hidden beast` number, since 1 + 4 + 2 + 1 + 9 + 560 + 8 + 1 + 76 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 39544504164 + 1382411577600 = 198858^2 + 1175760^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1421956081764.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 164554884 + ... + 164563524.

Almost surely, 2^{1421956081764} is an apocalyptic number.

1421956081764 is the 1192458-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421956081764

1421956081764 is an abundant number, since it is smaller than the sum of its proper divisors (2335940262165).

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

1421956081764 is an frugal number, since it uses more digits than its factorization.

1421956081764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17338 (or 8669 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 1421956081764 in words is "one trillion, four hundred twenty-one billion, nine hundred fifty-six million, eighty-one thousand, seven hundred sixty-four".