21510010671 has 8 divisors (see below), whose sum is σ = 28683508224. Its totient is φ = 14338260120.

The previous prime is 21510010663. The next prime is 21510010673. The reversal of 21510010671 is 17601001512.

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

It is not a de Polignac number, because 21510010671 - 2³ = 21510010663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21510010673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407745 + ... + 457466.

It is an arithmetic number, because the mean of its divisors is an integer number (3585438528).

Almost surely, 2^21510010671 is an apocalyptic number.

21510010671 is a deficient number, since it is larger than the sum of its proper divisors (7173497553).

21510010671 is an equidigital number, since it uses as much as digits as its factorization.

21510010671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873501.

The product of its (nonzero) digits is 420, while the sum is 24.

The spelling of 21510010671 in words is "twenty-one billion, five hundred ten million, ten thousand, six hundred seventy-one".