21143492111 has 6 divisors (see below), whose sum is σ = 24595490880. Its totient is φ = 18122993196.

The previous prime is 21143492081. The next prime is 21143492119. The reversal of 21143492111 is 11129434112.

It is not a de Polignac number, because 21143492111 - 2¹⁰ = 21143491087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143492119) 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, 215749871 + ... + 215749968.

It is an arithmetic number, because the mean of its divisors is an integer number (4099248480).

Almost surely, 2^21143492111 is an apocalyptic number.

21143492111 is a deficient number, since it is larger than the sum of its proper divisors (3451998769).

21143492111 is an equidigital number, since it uses as much as digits as its factorization.

21143492111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431499853 (or 431499846 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The spelling of 21143492111 in words is "twenty-one billion, one hundred forty-three million, four hundred ninety-two thousand, one hundred eleven".