211021013380 has 24 divisors (see below), whose sum is σ = 443515631832. Its totient is φ = 84337642752.

The previous prime is 211021013377. The next prime is 211021013381. The reversal of 211021013380 is 83310120112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 433638976 + 210587374404 = 20824^2 + 458898^2 .

It is not an unprimeable number, because it can be changed into a prime (211021013381) 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, 4398207 + ... + 4445926.

It is an arithmetic number, because the mean of its divisors is an integer number (18479817993).

Almost surely, 2^211021013380 is an apocalyptic number.

211021013380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211021013380 is an abundant number, since it is smaller than the sum of its proper divisors (232494618452).

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

211021013380 is a wasteful number, since it uses less digits than its factorization.

211021013380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8845335 (or 8845333 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 211021013380 its reverse (83310120112), we get a palindrome (294331133492).

The spelling of 211021013380 in words is "two hundred eleven billion, twenty-one million, thirteen thousand, three hundred eighty".