21177545446 has 8 divisors (see below), whose sum is σ = 31774386384. Its totient is φ = 10586083320.

The previous prime is 21177545443. The next prime is 21177545471. The reversal of 21177545446 is 64454577112.

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

It is a super-2 number, since 2×21177545446² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21177545396 and 21177545405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21177545443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1334845 + ... + 1350616.

It is an arithmetic number, because the mean of its divisors is an integer number (3971798298).

Almost surely, 2^21177545446 is an apocalyptic number.

21177545446 is a deficient number, since it is larger than the sum of its proper divisors (10596840938).

21177545446 is a wasteful number, since it uses less digits than its factorization.

21177545446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689406.

The product of its digits is 940800, while the sum is 46.

The spelling of 21177545446 in words is "twenty-one billion, one hundred seventy-seven million, five hundred forty-five thousand, four hundred forty-six".