21115540615045 has 8 divisors (see below), whose sum is σ = 25411252318200. Its totient is φ = 16844030105280.

The previous prime is 21115540615033. The next prime is 21115540615061. The reversal of 21115540615045 is 54051604551112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6382702012801 + 14732838602244 = 2526401^2 + 3838338^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-21115540615045 is a prime.

It is a super-2 number, since 2×21115540615045² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21115540614989 and 21115540615007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6050296426 + ... + 6050299915.

It is an arithmetic number, because the mean of its divisors is an integer number (3176406539775).

Almost surely, 2^{21115540615045} is an apocalyptic number.

It is an amenable number.

21115540615045 is a deficient number, since it is larger than the sum of its proper divisors (4295711703155).

21115540615045 is a wasteful number, since it uses less digits than its factorization.

21115540615045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12100596695.

The product of its (nonzero) digits is 120000, while the sum is 40.

The spelling of 21115540615045 in words is "twenty-one trillion, one hundred fifteen billion, five hundred forty million, six hundred fifteen thousand, forty-five".