202120212220001 has 4 divisors (see below), whose sum is σ = 202123194423492. Its totient is φ = 202117230016512.

The previous prime is 202120212219923. The next prime is 202120212220007. The reversal of 202120212220001 is 100022212021202.

It is a happy number.

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 87824356246225 + 114295855973776 = 9371465^2 + 10690924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202120212220001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202120212220007) 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, 1491000080 + ... + 1491135633.

It is an arithmetic number, because the mean of its divisors is an integer number (50530798605873).

Almost surely, 2^{202120212220001} is an apocalyptic number.

It is an amenable number.

202120212220001 is a deficient number, since it is larger than the sum of its proper divisors (2982203491).

202120212220001 is an equidigital number, since it uses as much as digits as its factorization.

202120212220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982203490.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202120212220001 its reverse (100022212021202), we get a palindrome (302142424241203).

The spelling of 202120212220001 in words is "two hundred two trillion, one hundred twenty billion, two hundred twelve million, two hundred twenty thousand, one".