131122021 has 8 divisors (see below), whose sum is σ = 142783200. Its totient is φ = 119936880.

The previous prime is 131121997. The next prime is 131122031. The reversal of 131122021 is 120221131.

131122021 = 2618² + 2619² + ... + 2636².

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

It is a cyclic number.

It is not a de Polignac number, because 131122021 - 2¹¹ = 131119973 is a prime.

It is a super-2 number, since 2×131122021² = 34385968782248882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131121992 and 131122010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131122031) 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, 118435 + ... + 119536.

It is an arithmetic number, because the mean of its divisors is an integer number (17847900).

Almost surely, 2^131122021 is an apocalyptic number.

It is an amenable number.

131122021 is a deficient number, since it is larger than the sum of its proper divisors (11661179).

131122021 is a wasteful number, since it uses less digits than its factorization.

131122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238019.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 131122021 is about 11450.8524136852. The cubic root of 131122021 is about 508.0329470540.

Adding to 131122021 its reverse (120221131), we get a palindrome (251343152).

It can be divided in two parts, 1311 and 22021, that added together give a palindrome (23332).

The spelling of 131122021 in words is "one hundred thirty-one million, one hundred twenty-two thousand, twenty-one".