21073377545 has 48 divisors (see below), whose sum is σ = 28732596480. Its totient is φ = 14817623040.

The previous prime is 21073377529. The next prime is 21073377557. The reversal of 21073377545 is 54577337012.

It is a happy number.

It is not a de Polignac number, because 21073377545 - 2⁴ = 21073377529 is a prime.

It is a super-2 number, since 2×21073377545² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21073377496 and 21073377505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2355641 + ... + 2364569.

It is an arithmetic number, because the mean of its divisors is an integer number (598595760).

Almost surely, 2^21073377545 is an apocalyptic number.

It is an amenable number.

21073377545 is a deficient number, since it is larger than the sum of its proper divisors (7659218935).

21073377545 is a wasteful number, since it uses less digits than its factorization.

21073377545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9086 (or 9075 counting only the distinct ones).

The product of its (nonzero) digits is 617400, while the sum is 44.

The spelling of 21073377545 in words is "twenty-one billion, seventy-three million, three hundred seventy-seven thousand, five hundred forty-five".