2021551631201 has 4 divisors (see below), whose sum is σ = 2076188161812. Its totient is φ = 1966915100592.

The previous prime is 2021551631129. The next prime is 2021551631207. The reversal of 2021551631201 is 1021361551202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 754465960000 + 1267085671201 = 868600^2 + 1125649^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021551631201 - 2³⁴ = 2004371762017 is a prime.

It is a super-2 number, since 2×2021551631201² (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 (2021551631207) 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, 27318265250 + ... + 27318265323.

It is an arithmetic number, because the mean of its divisors is an integer number (519047040453).

Almost surely, 2^{2021551631201} is an apocalyptic number.

It is an amenable number.

2021551631201 is a deficient number, since it is larger than the sum of its proper divisors (54636530611).

2021551631201 is an equidigital number, since it uses as much as digits as its factorization.

2021551631201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54636530610.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 2021551631201 in words is "two trillion, twenty-one billion, five hundred fifty-one million, six hundred thirty-one thousand, two hundred one".