21350871 has 10 divisors (see below), whose sum is σ = 31894632. Its totient is φ = 14233860.

The previous prime is 21350869. The next prime is 21350897. The reversal of 21350871 is 17805312.

It is not a de Polignac number, because 21350871 - 2¹ = 21350869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21350071) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 131715 + ... + 131876.

Almost surely, 2^21350871 is an apocalyptic number.

21350871 is a deficient number, since it is larger than the sum of its proper divisors (10543761).

21350871 is an equidigital number, since it uses as much as digits as its factorization.

21350871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263603 (or 263594 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 21350871 is about 4620.7002716039. The cubic root of 21350871 is about 277.4204885421.

The spelling of 21350871 in words is "twenty-one million, three hundred fifty thousand, eight hundred seventy-one".