20100221222001 has 4 divisors (see below), whose sum is σ = 26800294962672. Its totient is φ = 13400147481332.

The previous prime is 20100221221991. The next prime is 20100221222051. The reversal of 20100221222001 is 10022212200102.

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 20100221222001 - 2¹⁸ = 20100220959857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20100221222051) 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, 3350036870331 + ... + 3350036870336.

It is an arithmetic number, because the mean of its divisors is an integer number (6700073740668).

Almost surely, 2^{20100221222001} is an apocalyptic number.

It is an amenable number.

20100221222001 is a deficient number, since it is larger than the sum of its proper divisors (6700073740671).

20100221222001 is an equidigital number, since it uses as much as digits as its factorization.

20100221222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700073740670.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20100221222001 its reverse (10022212200102), we get a palindrome (30122433422103).

The spelling of 20100221222001 in words is "twenty trillion, one hundred billion, two hundred twenty-one million, two hundred twenty-two thousand, one".