216124421629 has 2 divisors, whose sum is σ = 216124421630. Its totient is φ = 216124421628.

The previous prime is 216124421599. The next prime is 216124421657. The reversal of 216124421629 is 926124421612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171497859129 + 44626562500 = 414123^2 + 211250^2 .

It is a cyclic number.

It is not a de Polignac number, because 216124421629 - 2²⁵ = 216090867197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216124421591 and 216124421600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216124421129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108062210814 + 108062210815.

It is an arithmetic number, because the mean of its divisors is an integer number (108062210815).

Almost surely, 2^216124421629 is an apocalyptic number.

It is an amenable number.

216124421629 is a deficient number, since it is larger than the sum of its proper divisors (1).

216124421629 is an equidigital number, since it uses as much as digits as its factorization.

216124421629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The spelling of 216124421629 in words is "two hundred sixteen billion, one hundred twenty-four million, four hundred twenty-one thousand, six hundred twenty-nine".