2121011231 has 4 divisors (see below), whose sum is σ = 2121552552. Its totient is φ = 2120469912.

The previous prime is 2121011201. The next prime is 2121011281. The reversal of 2121011231 is 1321101212.

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 2121011231 - 2¹⁴ = 2120994847 is a prime.

It is a super-2 number, since 2×2121011231² = 8997377284056270722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121011201) 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, 264740 + ... + 272633.

It is an arithmetic number, because the mean of its divisors is an integer number (530388138).

Almost surely, 2^2121011231 is an apocalyptic number.

2121011231 is a deficient number, since it is larger than the sum of its proper divisors (541321).

2121011231 is an equidigital number, since it uses as much as digits as its factorization.

2121011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541320.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 2121011231 is about 46054.4376906287. The cubic root of 2121011231 is about 1284.8358798606.

Adding to 2121011231 its reverse (1321101212), we get a palindrome (3442112443).

The spelling of 2121011231 in words is "two billion, one hundred twenty-one million, eleven thousand, two hundred thirty-one".