20021112112221 has 64 divisors (see below), whose sum is σ = 32523486720000. Its totient is φ = 12071720485440.

The previous prime is 20021112112171. The next prime is 20021112112223. The reversal of 20021112112221 is 12221121112002.

20021112112221 is a `hidden beast` number, since 20 + 0 + 211 + 1 + 211 + 2 + 221 = 666.

It is not a de Polignac number, because 20021112112221 - 2²² = 20021107917917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021112112194 and 20021112112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021112112223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1077379296 + ... + 1077397878.

It is an arithmetic number, because the mean of its divisors is an integer number (508179480000).

Almost surely, 2^{20021112112221} is an apocalyptic number.

It is an amenable number.

20021112112221 is a deficient number, since it is larger than the sum of its proper divisors (12502374607779).

20021112112221 is a wasteful number, since it uses less digits than its factorization.

20021112112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37031 (or 37025 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20021112112221 its reverse (12221121112002), we get a palindrome (32242233224223).

The spelling of 20021112112221 in words is "twenty trillion, twenty-one billion, one hundred twelve million, one hundred twelve thousand, two hundred twenty-one".