211431423220 has 24 divisors (see below), whose sum is σ = 447246914184. Its totient is φ = 83955250176.

The previous prime is 211431423209. The next prime is 211431423227. The reversal of 211431423220 is 22324134112.

It can be written as a sum of positive squares in 4 ways, for example, as 53641339236 + 157790083984 = 231606^2 + 397228^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211431423227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38579637 + ... + 38585116.

It is an arithmetic number, because the mean of its divisors is an integer number (18635288091).

Almost surely, 2^211431423220 is an apocalyptic number.

211431423220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211431423220 is an abundant number, since it is smaller than the sum of its proper divisors (235815490964).

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

211431423220 is a wasteful number, since it uses less digits than its factorization.

211431423220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77164899 (or 77164897 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 211431423220 its reverse (22324134112), we get a palindrome (233755557332).

The spelling of 211431423220 in words is "two hundred eleven billion, four hundred thirty-one million, four hundred twenty-three thousand, two hundred twenty".