1204789421641 has 27 divisors (see below), whose sum is σ = 1364153715687. Its totient is φ = 1063470785520.

The previous prime is 1204789421639. The next prime is 1204789421681. The reversal of 1204789421641 is 1461249874021.

The square root of 1204789421641 is 1097629.

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

It can be written as a sum of positive squares in only one way, i.e., 178223287225 + 1026566134416 = 422165^2 + 1013196^2 .

It is not a de Polignac number, because 1204789421641 - 2¹ = 1204789421639 is a prime.

It is a super-4 number, since 4×1204789421641⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1204789421681) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 328189236 + ... + 328192906.

Almost surely, 2^{1204789421641} is an apocalyptic number.

1204789421641 is the 1097629-th square number.

1204789421641 is the 548815-th centered octagonal number.

It is an amenable number.

1204789421641 is a deficient number, since it is larger than the sum of its proper divisors (159364294046).

1204789421641 is an frugal number, since it uses more digits than its factorization.

1204789421641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7414 (or 3707 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

Multiplying 1204789421641 by its sum of digits (49), we get a square (59034681660409 = 7683403²).

The spelling of 1204789421641 in words is "one trillion, two hundred four billion, seven hundred eighty-nine million, four hundred twenty-one thousand, six hundred forty-one".