21121526616305 has 32 divisors (see below), whose sum is σ = 27113805778560. Its totient is φ = 15748135603200.

The previous prime is 21121526616251. The next prime is 21121526616313. The reversal of 21121526616305 is 50361662512112.

It is not a de Polignac number, because 21121526616305 - 2⁶ = 21121526616241 is a prime.

It is a super-2 number, since 2×21121526616305² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2626505 + ... + 7010105.

It is an arithmetic number, because the mean of its divisors is an integer number (847306430580).

Almost surely, 2^{21121526616305} is an apocalyptic number.

It is an amenable number.

21121526616305 is a deficient number, since it is larger than the sum of its proper divisors (5992279162255).

21121526616305 is a wasteful number, since it uses less digits than its factorization.

21121526616305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384449.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 21121526616305 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred twenty-six million, six hundred sixteen thousand, three hundred five".