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31102312421 is a prime number
BaseRepresentation
bin11100111101110101…
…111001111111100101
32222021120111011202002
4130331311321333211
51002144142444141
622142130255045
72150513202455
oct347565717745
988246434662
1031102312421
1112210498734
126040127485
132c1887547b
1417109c9d65
15c207b9e9b
hex73dd79fe5

31102312421 has 2 divisors, whose sum is σ = 31102312422. Its totient is φ = 31102312420.

The previous prime is 31102312411. The next prime is 31102312427. The reversal of 31102312421 is 12421320113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18426705025 + 12675607396 = 135745^2 + 112586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-31102312421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31102312393 and 31102312402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31102312427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15551156210 + 15551156211.

It is an arithmetic number, because the mean of its divisors is an integer number (15551156211).

Almost surely, 231102312421 is an apocalyptic number.

It is an amenable number.

31102312421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31102312421 is an equidigital number, since it uses as much as digits as its factorization.

31102312421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31102312421 its reverse (12421320113), we get a palindrome (43523632534).

The spelling of 31102312421 in words is "thirty-one billion, one hundred two million, three hundred twelve thousand, four hundred twenty-one".