216403012205531 has 2 divisors, whose sum is σ = 216403012205532. Its totient is φ = 216403012205530.

The previous prime is 216403012205423. The next prime is 216403012205537. The reversal of 216403012205531 is 135502210304612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216403012205531 - 2¹⁰ = 216403012204507 is a prime.

It is a super-2 number, since 2×216403012205531² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216403012205491 and 216403012205500.

It is not a weakly prime, because it can be changed into another prime (216403012205537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108201506102765 + 108201506102766.

It is an arithmetic number, because the mean of its divisors is an integer number (108201506102766).

Almost surely, 2^{216403012205531} is an apocalyptic number.

216403012205531 is a deficient number, since it is larger than the sum of its proper divisors (1).

216403012205531 is an equidigital number, since it uses as much as digits as its factorization.

216403012205531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 216403012205531 in words is "two hundred sixteen trillion, four hundred three billion, twelve million, two hundred five thousand, five hundred thirty-one".