20112021 has 12 divisors (see below), whose sum is σ = 29103360. Its totient is φ = 13383720.

The previous prime is 20112007. The next prime is 20112023. The reversal of 20112021 is 12021102.

It is not a de Polignac number, because 20112021 - 2¹⁰ = 20110997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20111994 and 20112012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4236 + ... + 7626.

It is an arithmetic number, because the mean of its divisors is an integer number (2425280).

Almost surely, 2^20112021 is an apocalyptic number.

It is an amenable number.

20112021 is a deficient number, since it is larger than the sum of its proper divisors (8991339).

20112021 is a wasteful number, since it uses less digits than its factorization.

20112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056 (or 4053 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 20112021 is about 4484.6427951399. The cubic root of 20112021 is about 271.9476047074.

Adding to 20112021 its reverse (12021102), we get a palindrome (32133123).

The spelling of 20112021 in words is "twenty million, one hundred twelve thousand, twenty-one".