211557130780 has 48 divisors (see below), whose sum is σ = 446112283680. Its totient is φ = 84272652288.

The previous prime is 211557130747. The next prime is 211557130793. The reversal of 211557130780 is 87031755112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4813384 + ... + 4857136.

It is an arithmetic number, because the mean of its divisors is an integer number (9294005910).

Almost surely, 2^211557130780 is an apocalyptic number.

211557130780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211557130780 is an abundant number, since it is smaller than the sum of its proper divisors (234555152900).

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

211557130780 is a wasteful number, since it uses less digits than its factorization.

211557130780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44758 (or 44756 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 40.

Adding to 211557130780 its reverse (87031755112), we get a palindrome (298588885892).

The spelling of 211557130780 in words is "two hundred eleven billion, five hundred fifty-seven million, one hundred thirty thousand, seven hundred eighty".