21141511445 has 16 divisors (see below), whose sum is σ = 25476691440. Its totient is φ = 16842069504.

The previous prime is 21141511439. The next prime is 21141511453. The reversal of 21141511445 is 54411514112.

It can be written as a sum of positive squares in 8 ways, for example, as 8248817329 + 12892694116 = 90823^2 + 113546^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141511445 - 2³⁰ = 20067769621 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1666667 + ... + 1679303.

It is an arithmetic number, because the mean of its divisors is an integer number (1592293215).

Almost surely, 2^21141511445 is an apocalyptic number.

It is an amenable number.

21141511445 is a deficient number, since it is larger than the sum of its proper divisors (4335179995).

21141511445 is a wasteful number, since it uses less digits than its factorization.

21141511445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14024.

The product of its digits is 3200, while the sum is 29.

The spelling of 21141511445 in words is "twenty-one billion, one hundred forty-one million, five hundred eleven thousand, four hundred forty-five".