213121201331 has 8 divisors (see below), whose sum is σ = 218221196544. Its totient is φ = 208079492040.

The previous prime is 213121201277. The next prime is 213121201343. The reversal of 213121201331 is 133102121312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213121201331 is a prime.

It is a super-2 number, since 2×213121201331² (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 (213121201031) 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, 14564081 + ... + 14578706.

It is an arithmetic number, because the mean of its divisors is an integer number (27277649568).

Almost surely, 2^213121201331 is an apocalyptic number.

213121201331 is a deficient number, since it is larger than the sum of its proper divisors (5099995213).

213121201331 is a wasteful number, since it uses less digits than its factorization.

213121201331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29142961.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 213121201331 its reverse (133102121312), we get a palindrome (346223322643).

The spelling of 213121201331 in words is "two hundred thirteen billion, one hundred twenty-one million, two hundred one thousand, three hundred thirty-one".