20000122101221 has 4 divisors (see below), whose sum is σ = 20000143996812. Its totient is φ = 20000100205632.

The previous prime is 20000122101217. The next prime is 20000122101227. The reversal of 20000122101221 is 12210122100002.

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 7276533225025 + 12723588876196 = 2697505^2 + 3567014^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000122101221 - 2² = 20000122101217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000122101196 and 20000122101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000122101227) 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, 9515156 + ... + 11425341.

It is an arithmetic number, because the mean of its divisors is an integer number (5000035999203).

Almost surely, 2^{20000122101221} is an apocalyptic number.

It is an amenable number.

20000122101221 is a deficient number, since it is larger than the sum of its proper divisors (21895591).

20000122101221 is an equidigital number, since it uses as much as digits as its factorization.

20000122101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21895590.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20000122101221 its reverse (12210122100002), we get a palindrome (32210244201223).

It can be divided in two parts, 20000 and 122101221, that added together give a palindrome (122121221).

The spelling of 20000122101221 in words is "twenty trillion, one hundred twenty-two million, one hundred one thousand, two hundred twenty-one".