211243431020 has 24 divisors (see below), whose sum is σ = 443758077504. Its totient is φ = 84469396736.

The previous prime is 211243431013. The next prime is 211243431031. The reversal of 211243431020 is 20134342112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1686509 + ... + 1807428.

It is an arithmetic number, because the mean of its divisors is an integer number (18489919896).

Almost surely, 2^211243431020 is an apocalyptic number.

211243431020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211243431020 is an abundant number, since it is smaller than the sum of its proper divisors (232514646484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211243431020 is a wasteful number, since it uses less digits than its factorization.

211243431020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496969 (or 3496967 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 211243431020 its reverse (20134342112), we get a palindrome (231377773132).

The spelling of 211243431020 in words is "two hundred eleven billion, two hundred forty-three million, four hundred thirty-one thousand, twenty".