31541042221 has 8 divisors (see below), whose sum is σ = 34397242880. Its totient is φ = 28746265392.

The previous prime is 31541042213. The next prime is 31541042243. The reversal of 31541042221 is 12224014513.

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

It is not a de Polignac number, because 31541042221 - 2³ = 31541042213 is a prime.

It is a super-2 number, since 2×31541042221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31541042921) 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, 15354885 + ... + 15356938.

It is an arithmetic number, because the mean of its divisors is an integer number (4299655360).

Almost surely, 2^31541042221 is an apocalyptic number.

It is an amenable number.

31541042221 is a deficient number, since it is larger than the sum of its proper divisors (2856200659).

31541042221 is a wasteful number, since it uses less digits than its factorization.

31541042221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30711915.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 31541042221 its reverse (12224014513), we get a palindrome (43765056734).

The spelling of 31541042221 in words is "thirty-one billion, five hundred forty-one million, forty-two thousand, two hundred twenty-one".