21357123332357 has 16 divisors (see below), whose sum is σ = 22072557386880. Its totient is φ = 20651677368000.

The previous prime is 21357123332353. The next prime is 21357123332423. The reversal of 21357123332357 is 75323332175312.

It is a cyclic number.

It is not a de Polignac number, because 21357123332357 - 2² = 21357123332353 is a prime.

It is a super-2 number, since 2×21357123332357² (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 (21357123332353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40698119 + ... + 41219547.

It is an arithmetic number, because the mean of its divisors is an integer number (1379534836680).

Almost surely, 2^{21357123332357} is an apocalyptic number.

It is an amenable number.

21357123332357 is a deficient number, since it is larger than the sum of its proper divisors (715434054523).

21357123332357 is a wasteful number, since it uses less digits than its factorization.

21357123332357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531004.

The product of its digits is 2381400, while the sum is 47.

The spelling of 21357123332357 in words is "twenty-one trillion, three hundred fifty-seven billion, one hundred twenty-three million, three hundred thirty-two thousand, three hundred fifty-seven".