2135211223231 has 4 divisors (see below), whose sum is σ = 2136726633600. Its totient is φ = 2133695812864.

The previous prime is 2135211223217. The next prime is 2135211223303. The reversal of 2135211223231 is 1323221125312.

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 2135211223231 - 2³⁵ = 2100851484863 is a prime.

It is a super-2 number, since 2×2135211223231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2135211223231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135211223031) 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, 757703071 + ... + 757705888.

It is an arithmetic number, because the mean of its divisors is an integer number (534181658400).

Almost surely, 2^{2135211223231} is an apocalyptic number.

2135211223231 is a deficient number, since it is larger than the sum of its proper divisors (1515410369).

2135211223231 is a wasteful number, since it uses less digits than its factorization.

2135211223231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515410368.

The product of its digits is 4320, while the sum is 28.

Adding to 2135211223231 its reverse (1323221125312), we get a palindrome (3458432348543).

The spelling of 2135211223231 in words is "two trillion, one hundred thirty-five billion, two hundred eleven million, two hundred twenty-three thousand, two hundred thirty-one".