215388024109 has 2 divisors, whose sum is σ = 215388024110. Its totient is φ = 215388024108.

The previous prime is 215388024101. The next prime is 215388024199. The reversal of 215388024109 is 901420883512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147876395209 + 67511628900 = 384547^2 + 259830^2 .

It is a cyclic number.

It is not a de Polignac number, because 215388024109 - 2³ = 215388024101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215388024101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107694012054 + 107694012055.

It is an arithmetic number, because the mean of its divisors is an integer number (107694012055).

Almost surely, 2^215388024109 is an apocalyptic number.

It is an amenable number.

215388024109 is a deficient number, since it is larger than the sum of its proper divisors (1).

215388024109 is an equidigital number, since it uses as much as digits as its factorization.

215388024109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 215388024109 in words is "two hundred fifteen billion, three hundred eighty-eight million, twenty-four thousand, one hundred nine".