20201100121221 has 4 divisors (see below), whose sum is σ = 26934800161632. Its totient is φ = 13467400080812.

The previous prime is 20201100121201. The next prime is 20201100121231. The reversal of 20201100121221 is 12212100110202.

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 20201100121221 - 2¹⁴ = 20201100104837 is a prime.

It is a super-2 number, since 2×20201100121221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20201100121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201100121201) 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, 3366850020201 + ... + 3366850020206.

It is an arithmetic number, because the mean of its divisors is an integer number (6733700040408).

Almost surely, 2^{20201100121221} is an apocalyptic number.

It is an amenable number.

20201100121221 is a deficient number, since it is larger than the sum of its proper divisors (6733700040411).

20201100121221 is an equidigital number, since it uses as much as digits as its factorization.

20201100121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733700040410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20201100121221 its reverse (12212100110202), we get a palindrome (32413200231423).

The spelling of 20201100121221 in words is "twenty trillion, two hundred one billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-one".