1621525320201 has 4 divisors (see below), whose sum is σ = 2162033760272. Its totient is φ = 1081016880132.

The previous prime is 1621525320199. The next prime is 1621525320229. The reversal of 1621525320201 is 1020235251261.

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 1621525320201 - 2¹ = 1621525320199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621525320301) 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, 270254220031 + ... + 270254220036.

It is an arithmetic number, because the mean of its divisors is an integer number (540508440068).

Almost surely, 2^{1621525320201} is an apocalyptic number.

It is an amenable number.

1621525320201 is a deficient number, since it is larger than the sum of its proper divisors (540508440071).

1621525320201 is an equidigital number, since it uses as much as digits as its factorization.

1621525320201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540508440070.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 1621525320201 in words is "one trillion, six hundred twenty-one billion, five hundred twenty-five million, three hundred twenty thousand, two hundred one".