21703618360157 has 4 divisors (see below), whose sum is σ = 21703680307356. Its totient is φ = 21703556412960.

The previous prime is 21703618360141. The next prime is 21703618360181. The reversal of 21703618360157 is 75106381630712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2007871996036 + 19695746364121 = 1416994^2 + 4437989^2 .

It is a cyclic number.

It is not a de Polignac number, because 21703618360157 - 2⁴ = 21703618360141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21703618360187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30445058 + ... + 31149779.

It is an arithmetic number, because the mean of its divisors is an integer number (5425920076839).

Almost surely, 2^{21703618360157} is an apocalyptic number.

It is an amenable number.

21703618360157 is a deficient number, since it is larger than the sum of its proper divisors (61947199).

21703618360157 is an equidigital number, since it uses as much as digits as its factorization.

21703618360157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61947198.

The product of its (nonzero) digits is 1270080, while the sum is 50.

Adding to 21703618360157 its reverse (75106381630712), we get a palindrome (96809999990869).

The spelling of 21703618360157 in words is "twenty-one trillion, seven hundred three billion, six hundred eighteen million, three hundred sixty thousand, one hundred fifty-seven".