31221221111021 has 8 divisors (see below), whose sum is σ = 31224297398400. Its totient is φ = 31218145018560.

The previous prime is 31221221110987. The next prime is 31221221111081. The reversal of 31221221111021 is 12011112212213.

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 31221221111021 - 2²² = 31221216916717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31221221110984 and 31221221111002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221221111081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 760749020 + ... + 760790058.

It is an arithmetic number, because the mean of its divisors is an integer number (3903037174800).

Almost surely, 2^{31221221111021} is an apocalyptic number.

It is an amenable number.

31221221111021 is a deficient number, since it is larger than the sum of its proper divisors (3076287379).

31221221111021 is a wasteful number, since it uses less digits than its factorization.

31221221111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97459.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 31221221111021 its reverse (12011112212213), we get a palindrome (43232333323234).

The spelling of 31221221111021 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, twenty-one".