20210100111 has 24 divisors (see below), whose sum is σ = 29932235424. Its totient is φ = 13132535040.

The previous prime is 20210100107. The next prime is 20210100133. The reversal of 20210100111 is 11100101202.

It is a happy number.

It is not a de Polignac number, because 20210100111 - 2² = 20210100107 is a prime.

It is a super-3 number, since 3×20210100111³ (a number of 32 digits) contains 333 as substring.

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 = 20210100093 and 20210100102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210100181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 379830 + ... + 429756.

It is an arithmetic number, because the mean of its divisors is an integer number (1247176476).

Almost surely, 2^20210100111 is an apocalyptic number.

20210100111 is a deficient number, since it is larger than the sum of its proper divisors (9722135313).

20210100111 is a wasteful number, since it uses less digits than its factorization.

20210100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51071 (or 51068 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20210100111 its reverse (11100101202), we get a palindrome (31310201313).

The spelling of 20210100111 in words is "twenty billion, two hundred ten million, one hundred thousand, one hundred eleven".