20101121443 has 6 divisors (see below), whose sum is σ = 21766303284. Its totient is φ = 18554881176.

The previous prime is 20101121429. The next prime is 20101121449. The reversal of 20101121443 is 34412110102.

It is a de Polignac number, because none of the positive numbers 2^k-20101121443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20101121443.

It is not an unprimeable number, because it can be changed into a prime (20101121449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59470605 + ... + 59470942.

It is an arithmetic number, because the mean of its divisors is an integer number (3627717214).

Almost surely, 2^20101121443 is an apocalyptic number.

20101121443 is a deficient number, since it is larger than the sum of its proper divisors (1665181841).

20101121443 is a wasteful number, since it uses less digits than its factorization.

20101121443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118941573 (or 118941560 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20101121443 its reverse (34412110102), we get a palindrome (54513231545).

The spelling of 20101121443 in words is "twenty billion, one hundred one million, one hundred twenty-one thousand, four hundred forty-three".