21016495 has 8 divisors (see below), whose sum is σ = 25261920. Its totient is φ = 16785120.

The previous prime is 21016483. The next prime is 21016507. The reversal of 21016495 is 59461012.

It is an interprime number because it is at equal distance from previous prime (21016483) and next prime (21016507).

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

It is not a de Polignac number, because 21016495 - 2¹⁵ = 20983727 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126 + ... + 6484.

It is an arithmetic number, because the mean of its divisors is an integer number (3157740).

Almost surely, 2^21016495 is an apocalyptic number.

21016495 is a deficient number, since it is larger than the sum of its proper divisors (4245425).

21016495 is an equidigital number, since it uses as much as digits as its factorization.

21016495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7025.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21016495 is about 4584.3750937287. The cubic root of 21016495 is about 275.9646343750.

The spelling of 21016495 in words is "twenty-one million, sixteen thousand, four hundred ninety-five".