20021111200121 has 4 divisors (see below), whose sum is σ = 20022870072192. Its totient is φ = 20019352328052.

The previous prime is 20021111200039. The next prime is 20021111200151. The reversal of 20021111200121 is 12100211112002.

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 20021111200121 - 2¹⁴ = 20021111183737 is a prime.

It is a super-2 number, since 2×20021111200121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021111200096 and 20021111200105.

It is not an unprimeable number, because it can be changed into a prime (20021111200151) 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, 879418961 + ... + 879441726.

It is an arithmetic number, because the mean of its divisors is an integer number (5005717518048).

Almost surely, 2^{20021111200121} is an apocalyptic number.

It is an amenable number.

20021111200121 is a deficient number, since it is larger than the sum of its proper divisors (1758872071).

20021111200121 is a wasteful number, since it uses less digits than its factorization.

20021111200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758872070.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20021111200121 its reverse (12100211112002), we get a palindrome (32121322312123).

The spelling of 20021111200121 in words is "twenty trillion, twenty-one billion, one hundred eleven million, two hundred thousand, one hundred twenty-one".