21510375472773 has 12 divisors (see below), whose sum is σ = 33895137108768. Its totient is φ = 13036591195560.

The previous prime is 21510375472759. The next prime is 21510375472783. The reversal of 21510375472773 is 37727457301512.

21510375472773 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 0 + 3 + 7 + 547 + 27 + 73 = 666.

It is not a de Polignac number, because 21510375472773 - 2¹² = 21510375468677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21510375472783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108638259865 + ... + 108638260062.

It is an arithmetic number, because the mean of its divisors is an integer number (2824594759064).

Almost surely, 2^{21510375472773} is an apocalyptic number.

It is an amenable number.

21510375472773 is a deficient number, since it is larger than the sum of its proper divisors (12384761635995).

21510375472773 is a wasteful number, since it uses less digits than its factorization.

21510375472773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217276519944 (or 217276519941 counting only the distinct ones).

The product of its (nonzero) digits is 8643600, while the sum is 54.

The spelling of 21510375472773 in words is "twenty-one trillion, five hundred ten billion, three hundred seventy-five million, four hundred seventy-two thousand, seven hundred seventy-three".