211221143300 has 36 divisors (see below), whose sum is σ = 474155055780. Its totient is φ = 81575061120.

The previous prime is 211221143293. The next prime is 211221143303. The reversal of 211221143300 is 3341122112.

It can be written as a sum of positive squares in 6 ways, for example, as 4065082564 + 207156060736 = 63758^2 + 455144^2 .

It is a super-2 number, since 2×211221143300² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (211221143303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36414539 + ... + 36420338.

Almost surely, 2^211221143300 is an apocalyptic number.

211221143300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221143300 is an abundant number, since it is smaller than the sum of its proper divisors (262933912480).

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

211221143300 is a wasteful number, since it uses less digits than its factorization.

211221143300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72834920 (or 72834913 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 211221143300 its reverse (3341122112), we get a palindrome (214562265412).

The spelling of 211221143300 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred forty-three thousand, three hundred".