21357051661342 has 8 divisors (see below), whose sum is σ = 32035734860256. Its totient is φ = 10678473374592.

The previous prime is 21357051661339. The next prime is 21357051661349. The reversal of 21357051661342 is 24316615075312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21357051661342² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21357051661292 and 21357051661301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357051661349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25717123 + ... + 26534590.

It is an arithmetic number, because the mean of its divisors is an integer number (4004466857532).

Almost surely, 2^{21357051661342} is an apocalyptic number.

21357051661342 is a deficient number, since it is larger than the sum of its proper divisors (10678683198914).

21357051661342 is a wasteful number, since it uses less digits than its factorization.

21357051661342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52456082.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 21357051661342 in words is "twenty-one trillion, three hundred fifty-seven billion, fifty-one million, six hundred sixty-one thousand, three hundred forty-two".