20211000111021 has 16 divisors (see below), whose sum is σ = 27185479200000. Its totient is φ = 13355769069888.

The previous prime is 20211000110999. The next prime is 20211000111161. The reversal of 20211000111021 is 12011100011202.

It is not a de Polignac number, because 20211000111021 - 2¹³ = 20211000102829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211000110988 and 20211000111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211000211021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63406021 + ... + 63723978.

It is an arithmetic number, because the mean of its divisors is an integer number (1699092450000).

Almost surely, 2^{20211000111021} is an apocalyptic number.

It is an amenable number.

20211000111021 is a deficient number, since it is larger than the sum of its proper divisors (6974479088979).

20211000111021 is a wasteful number, since it uses less digits than its factorization.

20211000111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127130468.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20211000111021 its reverse (12011100011202), we get a palindrome (32222100122223).

The spelling of 20211000111021 in words is "twenty trillion, two hundred eleven billion, one hundred eleven thousand, twenty-one".