1945326073421 has 4 divisors (see below), whose sum is σ = 1964212734432. Its totient is φ = 1926439412412.

The previous prime is 1945326073393. The next prime is 1945326073469. The reversal of 1945326073421 is 1243706235491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1945326073421 - 2³⁰ = 1944252331597 is a prime.

It is a super-3 number, since 3×1945326073421³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945326073121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9443330351 + ... + 9443330556.

It is an arithmetic number, because the mean of its divisors is an integer number (491053183608).

Almost surely, 2^{1945326073421} is an apocalyptic number.

It is an amenable number.

1945326073421 is a deficient number, since it is larger than the sum of its proper divisors (18886661011).

1945326073421 is a wasteful number, since it uses less digits than its factorization.

1945326073421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18886661010.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 1945326073421 in words is "one trillion, nine hundred forty-five billion, three hundred twenty-six million, seventy-three thousand, four hundred twenty-one".