1201053235521 has 4 divisors (see below), whose sum is σ = 1601404314032. Its totient is φ = 800702157012.

The previous prime is 1201053235517. The next prime is 1201053235523. The reversal of 1201053235521 is 1255323501021.

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 not a de Polignac number, because 1201053235521 - 2² = 1201053235517 is a prime.

It is a super-2 number, since 2×1201053235521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201053235523) 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, 200175539251 + ... + 200175539256.

It is an arithmetic number, because the mean of its divisors is an integer number (400351078508).

Almost surely, 2^{1201053235521} is an apocalyptic number.

It is an amenable number.

1201053235521 is a deficient number, since it is larger than the sum of its proper divisors (400351078511).

1201053235521 is an equidigital number, since it uses as much as digits as its factorization.

1201053235521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400351078510.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 1201053235521 its reverse (1255323501021), we get a palindrome (2456376736542).

The spelling of 1201053235521 in words is "one trillion, two hundred one billion, fifty-three million, two hundred thirty-five thousand, five hundred twenty-one".