21402673157 has 2 divisors, whose sum is σ = 21402673158. Its totient is φ = 21402673156.

The previous prime is 21402673151. The next prime is 21402673183. The reversal of 21402673157 is 75137620412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11050424641 + 10352248516 = 105121^2 + 101746^2 .

It is a cyclic number.

It is not a de Polignac number, because 21402673157 - 2²² = 21398478853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21402673157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21402673151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701336578 + 10701336579.

It is an arithmetic number, because the mean of its divisors is an integer number (10701336579).

Almost surely, 2^21402673157 is an apocalyptic number.

It is an amenable number.

21402673157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402673157 is an equidigital number, since it uses as much as digits as its factorization.

21402673157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 38.

The spelling of 21402673157 in words is "twenty-one billion, four hundred two million, six hundred seventy-three thousand, one hundred fifty-seven".