21173944452076 has 48 divisors (see below), whose sum is σ = 41194889693440. Its totient is φ = 9456679445760.

The previous prime is 21173944451987. The next prime is 21173944452079. The reversal of 21173944452076 is 67025444937112.

It is not an unprimeable number, because it can be changed into a prime (21173944452079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22817530 + ... + 23727358.

Almost surely, 2^{21173944452076} is an apocalyptic number.

21173944452076 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21173944452076 is a deficient number, since it is larger than the sum of its proper divisors (20020945241364).

21173944452076 is a wasteful number, since it uses less digits than its factorization.

21173944452076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924314 (or 924312 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 21173944452076 in words is "twenty-one trillion, one hundred seventy-three billion, nine hundred forty-four million, four hundred fifty-two thousand, seventy-six".