212144331 has 16 divisors (see below), whose sum is σ = 323751168. Its totient is φ = 121044000.

The previous prime is 212144321. The next prime is 212144357. The reversal of 212144331 is 133441212.

It is not a de Polignac number, because 212144331 - 2⁶ = 212144267 is a prime.

It is a super-2 number, since 2×212144331² = 90010434350875122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 212144298 and 212144307.

It is not an unprimeable number, because it can be changed into a prime (212144321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7516 + ... + 21926.

It is an arithmetic number, because the mean of its divisors is an integer number (20234448).

Almost surely, 2^212144331 is an apocalyptic number.

212144331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212144331 is a deficient number, since it is larger than the sum of its proper divisors (111606837).

212144331 is a wasteful number, since it uses less digits than its factorization.

212144331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15122.

The product of its digits is 576, while the sum is 21.

The square root of 212144331 is about 14565.1752821585. The cubic root of 212144331 is about 596.4084806545.

Adding to 212144331 its reverse (133441212), we get a palindrome (345585543).

The spelling of 212144331 in words is "two hundred twelve million, one hundred forty-four thousand, three hundred thirty-one".