31221021041 has 16 divisors (see below), whose sum is σ = 36855336960. Its totient is φ = 25881333840.

The previous prime is 31221020977. The next prime is 31221021053. The reversal of 31221021041 is 14012012213.

It is a cyclic number.

It is not a de Polignac number, because 31221021041 - 2⁶ = 31221020977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31221021071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306890 + ... + 395756.

It is an arithmetic number, because the mean of its divisors is an integer number (2303458560).

Almost surely, 2^31221021041 is an apocalyptic number.

31221021041 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31221021041 is a deficient number, since it is larger than the sum of its proper divisors (5634315919).

31221021041 is a wasteful number, since it uses less digits than its factorization.

31221021041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90524.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 31221021041 its reverse (14012012213), we get a palindrome (45233033254).

The spelling of 31221021041 in words is "thirty-one billion, two hundred twenty-one million, twenty-one thousand, forty-one".