20200121211001 has 4 divisors (see below), whose sum is σ = 20201318555904. Its totient is φ = 20198923866100.

The previous prime is 20200121210977. The next prime is 20200121211103. The reversal of 20200121211001 is 10011212100202.

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 a cyclic number.

It is not a de Polignac number, because 20200121211001 - 2²¹ = 20200119113849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20200121221001) 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, 598647145 + ... + 598680886.

It is an arithmetic number, because the mean of its divisors is an integer number (5050329638976).

Almost surely, 2^{20200121211001} is an apocalyptic number.

It is an amenable number.

20200121211001 is a deficient number, since it is larger than the sum of its proper divisors (1197344903).

20200121211001 is a wasteful number, since it uses less digits than its factorization.

20200121211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197344902.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20200121211001 its reverse (10011212100202), we get a palindrome (30211333311203).

The spelling of 20200121211001 in words is "twenty trillion, two hundred billion, one hundred twenty-one million, two hundred eleven thousand, one".