20012021101221 has 8 divisors (see below), whose sum is σ = 26682719170944. Its totient is φ = 13341335216160.

The previous prime is 20012021101213. The next prime is 20012021101223. The reversal of 20012021101221 is 12210112021002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20012021101221 - 2³ = 20012021101213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012021101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012021101223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1962676 + ... + 6623906.

It is an arithmetic number, because the mean of its divisors is an integer number (3335339896368).

Almost surely, 2^{20012021101221} is an apocalyptic number.

It is an amenable number.

20012021101221 is a deficient number, since it is larger than the sum of its proper divisors (6670698069723).

20012021101221 is a wasteful number, since it uses less digits than its factorization.

20012021101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6092331.

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

Adding to 20012021101221 its reverse (12210112021002), we get a palindrome (32222133122223).

The spelling of 20012021101221 in words is "twenty trillion, twelve billion, twenty-one million, one hundred one thousand, two hundred twenty-one".