1438195521921 has 8 divisors (see below), whose sum is σ = 1921790079264. Its totient is φ = 956698989600.

The previous prime is 1438195521871. The next prime is 1438195521977. The reversal of 1438195521921 is 1291255918341.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1438195521921 - 2¹⁸ = 1438195259777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1438195520921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524504655 + ... + 524507396.

It is an arithmetic number, because the mean of its divisors is an integer number (240223759908).

Almost surely, 2^{1438195521921} is an apocalyptic number.

It is an amenable number.

1438195521921 is a deficient number, since it is larger than the sum of its proper divisors (483594557343).

1438195521921 is a wasteful number, since it uses less digits than its factorization.

1438195521921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049012511.

The product of its digits is 777600, while the sum is 51.

The spelling of 1438195521921 in words is "one trillion, four hundred thirty-eight billion, one hundred ninety-five million, five hundred twenty-one thousand, nine hundred twenty-one".