31220002123 has 16 divisors (see below), whose sum is σ = 32229204480. Its totient is φ = 30224882016.

The previous prime is 31220002111. The next prime is 31220002129. The reversal of 31220002123 is 32120002213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220002123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31220002097 and 31220002106.

It is not an unprimeable number, because it can be changed into a prime (31220002129) 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, 2228286 + ... + 2242252.

It is an arithmetic number, because the mean of its divisors is an integer number (2014325280).

Almost surely, 2^31220002123 is an apocalyptic number.

31220002123 is a deficient number, since it is larger than the sum of its proper divisors (1009202357).

31220002123 is a wasteful number, since it uses less digits than its factorization.

31220002123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14466.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31220002123 its reverse (32120002213), we get a palindrome (63340004336).

The spelling of 31220002123 in words is "thirty-one billion, two hundred twenty million, two thousand, one hundred twenty-three".