212021221331 has 4 divisors (see below), whose sum is σ = 223180233000. Its totient is φ = 200862209664.

The previous prime is 212021221301. The next prime is 212021221337. The reversal of 212021221331 is 133122120212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212021221331 - 2¹⁴ = 212021204947 is a prime.

It is a super-2 number, since 2×212021221331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212021221337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5579505806 + ... + 5579505843.

It is an arithmetic number, because the mean of its divisors is an integer number (55795058250).

Almost surely, 2^212021221331 is an apocalyptic number.

212021221331 is a deficient number, since it is larger than the sum of its proper divisors (11159011669).

212021221331 is a wasteful number, since it uses less digits than its factorization.

212021221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11159011668.

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

Adding to 212021221331 its reverse (133122120212), we get a palindrome (345143341543).

The spelling of 212021221331 in words is "two hundred twelve billion, twenty-one million, two hundred twenty-one thousand, three hundred thirty-one".