21310353003157 has 4 divisors (see below), whose sum is σ = 21316251250060. Its totient is φ = 21304454756256.

The previous prime is 21310353003133. The next prime is 21310353003211. The reversal of 21310353003157 is 75130035301312.

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 375344923716 + 20935008079441 = 612654^2 + 4575479^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310353003157 - 2²³ = 21310344614549 is a prime.

It is a super-2 number, since 2×21310353003157² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310353003757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2949118032 + ... + 2949125257.

It is an arithmetic number, because the mean of its divisors is an integer number (5329062812515).

Almost surely, 2^{21310353003157} is an apocalyptic number.

It is an amenable number.

21310353003157 is a deficient number, since it is larger than the sum of its proper divisors (5898246903).

21310353003157 is an equidigital number, since it uses as much as digits as its factorization.

21310353003157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5898246902.

The product of its (nonzero) digits is 28350, while the sum is 34.

Adding to 21310353003157 its reverse (75130035301312), we get a palindrome (96440388304469).

The spelling of 21310353003157 in words is "twenty-one trillion, three hundred ten billion, three hundred fifty-three million, three thousand, one hundred fifty-seven".