20012002101221 has 4 divisors (see below), whose sum is σ = 21551386878252. Its totient is φ = 18472617324192.

The previous prime is 20012002101209. The next prime is 20012002101227. The reversal of 20012002101221 is 12210120021002.

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 12786066729121 + 7225935372100 = 3575761^2 + 2688110^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012002101221 - 2¹⁸ = 20012001839077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012002101196 and 20012002101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012002101227) 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, 769692388496 + ... + 769692388521.

It is an arithmetic number, because the mean of its divisors is an integer number (5387846719563).

Almost surely, 2^{20012002101221} is an apocalyptic number.

It is an amenable number.

20012002101221 is a deficient number, since it is larger than the sum of its proper divisors (1539384777031).

20012002101221 is a wasteful number, since it uses less digits than its factorization.

20012002101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539384777030.

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

Adding to 20012002101221 its reverse (12210120021002), we get a palindrome (32222122122223).

The spelling of 20012002101221 in words is "twenty trillion, twelve billion, two million, one hundred one thousand, two hundred twenty-one".