21518190127 has 8 divisors (see below), whose sum is σ = 24594891776. Its totient is φ = 18442157112.

The previous prime is 21518190121. The next prime is 21518190157. The reversal of 21518190127 is 72109181512.

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 21518190127 - 2¹¹ = 21518188079 is a prime.

It is a super-2 number, since 2×21518190127² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21518190121) 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, 96183 + ... + 228664.

It is an arithmetic number, because the mean of its divisors is an integer number (3074361472).

Almost surely, 2^21518190127 is an apocalyptic number.

21518190127 is a deficient number, since it is larger than the sum of its proper divisors (3076701649).

21518190127 is an equidigital number, since it uses as much as digits as its factorization.

21518190127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334317.

The product of its (nonzero) digits is 10080, while the sum is 37.

The spelling of 21518190127 in words is "twenty-one billion, five hundred eighteen million, one hundred ninety thousand, one hundred twenty-seven".