31020123022111 has 4 divisors (see below), whose sum is σ = 31050745059672. Its totient is φ = 30989500984552.

The previous prime is 31020123022069. The next prime is 31020123022121. The reversal of 31020123022111 is 11122032102013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31020123022111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020123022121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15311017261 + ... + 15311019286.

It is an arithmetic number, because the mean of its divisors is an integer number (7762686264918).

Almost surely, 2^{31020123022111} is an apocalyptic number.

31020123022111 is a deficient number, since it is larger than the sum of its proper divisors (30622037561).

31020123022111 is a wasteful number, since it uses less digits than its factorization.

31020123022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30622037560.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31020123022111 its reverse (11122032102013), we get a palindrome (42142155124124).

The spelling of 31020123022111 in words is "thirty-one trillion, twenty billion, one hundred twenty-three million, twenty-two thousand, one hundred eleven".