21142551361 has 8 divisors (see below), whose sum is σ = 21216571200. Its totient is φ = 21068659920.

The previous prime is 21142551337. The next prime is 21142551371. The reversal of 21142551361 is 16315524112.

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 21142551361 - 2⁵ = 21142551329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21142551371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303916 + ... + 366946.

It is an arithmetic number, because the mean of its divisors is an integer number (2652071400).

Almost surely, 2^21142551361 is an apocalyptic number.

It is an amenable number.

21142551361 is a deficient number, since it is larger than the sum of its proper divisors (74019839).

21142551361 is an equidigital number, since it uses as much as digits as its factorization.

21142551361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64199.

The product of its digits is 7200, while the sum is 31.

The spelling of 21142551361 in words is "twenty-one billion, one hundred forty-two million, five hundred fifty-one thousand, three hundred sixty-one".