1211202020001 has 4 divisors (see below), whose sum is σ = 1614936026672. Its totient is φ = 807468013332.

The previous prime is 1211202019997. The next prime is 1211202020053. The reversal of 1211202020001 is 1000202021121.

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 1211202020001 - 2² = 1211202019997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211202027001) 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, 201867003331 + ... + 201867003336.

It is an arithmetic number, because the mean of its divisors is an integer number (403734006668).

Almost surely, 2^{1211202020001} is an apocalyptic number.

It is an amenable number.

1211202020001 is a deficient number, since it is larger than the sum of its proper divisors (403734006671).

1211202020001 is an equidigital number, since it uses as much as digits as its factorization.

1211202020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403734006670.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1211202020001 its reverse (1000202021121), we get a palindrome (2211404041122).

The spelling of 1211202020001 in words is "one trillion, two hundred eleven billion, two hundred two million, twenty thousand, one".