20112100021 has 12 divisors (see below), whose sum is σ = 21989648928. Its totient is φ = 18384756624.

The previous prime is 20112099979. The next prime is 20112100067. The reversal of 20112100021 is 12000121102.

It is not a de Polignac number, because 20112100021 - 2²³ = 20103711413 is a prime.

It is a super-3 number, since 3×20112100021³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20112099980 and 20112100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112100091) 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, 560295 + ... + 595108.

It is an arithmetic number, because the mean of its divisors is an integer number (1832470744).

Almost surely, 2^20112100021 is an apocalyptic number.

It is an amenable number.

20112100021 is a deficient number, since it is larger than the sum of its proper divisors (1877548907).

20112100021 is a wasteful number, since it uses less digits than its factorization.

20112100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155532 (or 1155519 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20112100021 its reverse (12000121102), we get a palindrome (32112221123).

The spelling of 20112100021 in words is "twenty billion, one hundred twelve million, one hundred thousand, twenty-one".