21342556145 has 8 divisors (see below), whose sum is σ = 26206673856. Its totient is φ = 16676973936.

The previous prime is 21342556141. The next prime is 21342556171. The reversal of 21342556145 is 54165524312.

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

It is a cyclic number.

It is not a de Polignac number, because 21342556145 - 2² = 21342556141 is a prime.

It is a super-2 number, since 2×21342556145² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21342556099 and 21342556108.

It is not an unprimeable number, because it can be changed into a prime (21342556141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49633637 + ... + 49634066.

It is an arithmetic number, because the mean of its divisors is an integer number (3275834232).

Almost surely, 2^21342556145 is an apocalyptic number.

It is an amenable number.

21342556145 is a deficient number, since it is larger than the sum of its proper divisors (4864117711).

21342556145 is an equidigital number, since it uses as much as digits as its factorization.

21342556145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99267751.

The product of its digits is 144000, while the sum is 38.

The spelling of 21342556145 in words is "twenty-one billion, three hundred forty-two million, five hundred fifty-six thousand, one hundred forty-five".