31220121323043 has 12 divisors (see below), whose sum is σ = 45112389767848. Its totient is φ = 20805725460960.

The previous prime is 31220121322997. The next prime is 31220121323081. The reversal of 31220121323043 is 34032312102213.

31220121323043 is a `hidden beast` number, since 3 + 1 + 220 + 1 + 2 + 132 + 304 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-31220121323043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31220121322998 and 31220121323016.

It is not an unprimeable number, because it can be changed into a prime (31220121343043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 640703818 + ... + 640752543.

Almost surely, 2^{31220121323043} is an apocalyptic number.

31220121323043 is a deficient number, since it is larger than the sum of its proper divisors (13892268444805).

31220121323043 is a wasteful number, since it uses less digits than its factorization.

31220121323043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281459074 (or 1281459071 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 31220121323043 its reverse (34032312102213), we get a palindrome (65252433425256).

The spelling of 31220121323043 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-one million, three hundred twenty-three thousand, forty-three".