31011211021 has 16 divisors (see below), whose sum is σ = 35541725184. Its totient is φ = 26505877104.

The previous prime is 31011211013. The next prime is 31011211037. The reversal of 31011211021 is 12011211013.

It is a happy number.

It is not a de Polignac number, because 31011211021 - 2³ = 31011211013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31011210992 and 31011211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011211001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5232766 + ... + 5238688.

It is an arithmetic number, because the mean of its divisors is an integer number (2221357824).

Almost surely, 2^31011211021 is an apocalyptic number.

It is an amenable number.

31011211021 is a deficient number, since it is larger than the sum of its proper divisors (4530514163).

31011211021 is a wasteful number, since it uses less digits than its factorization.

31011211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7920.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 31011211021 its reverse (12011211013), we get a palindrome (43022422034).

The spelling of 31011211021 in words is "thirty-one billion, eleven million, two hundred eleven thousand, twenty-one".