21014616145 has 4 divisors (see below), whose sum is σ = 25217539380. Its totient is φ = 16811692912.

The previous prime is 21014616137. The next prime is 21014616167. The reversal of 21014616145 is 54161641012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4661065984 + 16353550161 = 68272^2 + 127881^2 .

It is a cyclic number.

It is not a de Polignac number, because 21014616145 - 2³ = 21014616137 is a prime.

It is a super-2 number, since 2×21014616145² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2101461610 + ... + 2101461619.

It is an arithmetic number, because the mean of its divisors is an integer number (6304384845).

Almost surely, 2^21014616145 is an apocalyptic number.

It is an amenable number.

21014616145 is a deficient number, since it is larger than the sum of its proper divisors (4202923235).

21014616145 is an equidigital number, since it uses as much as digits as its factorization.

21014616145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202923234.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 21014616145 in words is "twenty-one billion, fourteen million, six hundred sixteen thousand, one hundred forty-five".