21896019157 has 2 divisors, whose sum is σ = 21896019158. Its totient is φ = 21896019156.

The previous prime is 21896019149. The next prime is 21896019179. The reversal of 21896019157 is 75191069812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16003768036 + 5892251121 = 126506^2 + 76761^2 .

It is a cyclic number.

It is not a de Polignac number, because 21896019157 - 2³ = 21896019149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21896019157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21896011157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10948009578 + 10948009579.

It is an arithmetic number, because the mean of its divisors is an integer number (10948009579).

Almost surely, 2^21896019157 is an apocalyptic number.

It is an amenable number.

21896019157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21896019157 is an equidigital number, since it uses as much as digits as its factorization.

21896019157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 49.

The spelling of 21896019157 in words is "twenty-one billion, eight hundred ninety-six million, nineteen thousand, one hundred fifty-seven".