20102121102001 has 4 divisors (see below), whose sum is σ = 20132532783604. Its totient is φ = 20071709420400.

The previous prime is 20102121101999. The next prime is 20102121102023. The reversal of 20102121102001 is 10020112120102.

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 14222703690000 + 5879417412001 = 3771300^2 + 2424751^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102121102001 - 2¹ = 20102121101999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20102121102031) 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, 15205839810 + ... + 15205841131.

It is an arithmetic number, because the mean of its divisors is an integer number (5033133195901).

Almost surely, 2^{20102121102001} is an apocalyptic number.

It is an amenable number.

20102121102001 is a deficient number, since it is larger than the sum of its proper divisors (30411681603).

20102121102001 is an equidigital number, since it uses as much as digits as its factorization.

20102121102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30411681602.

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

Adding to 20102121102001 its reverse (10020112120102), we get a palindrome (30122233222103).

The spelling of 20102121102001 in words is "twenty trillion, one hundred two billion, one hundred twenty-one million, one hundred two thousand, one".