21034255 has 16 divisors (see below), whose sum is σ = 27654048. Its totient is φ = 15232000.

The previous prime is 21034249. The next prime is 21034261. The reversal of 21034255 is 55243012.

It is an interprime number because it is at equal distance from previous prime (21034249) and next prime (21034261).

It is not a de Polignac number, because 21034255 - 2¹³ = 21026063 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 14775 + ... + 16135.

It is an arithmetic number, because the mean of its divisors is an integer number (1728378).

Almost surely, 2^21034255 is an apocalyptic number.

21034255 is a deficient number, since it is larger than the sum of its proper divisors (6619793).

21034255 is a wasteful number, since it uses less digits than its factorization.

21034255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21034255 is about 4586.3116989581. The cubic root of 21034255 is about 276.0423471745.

Adding to 21034255 its reverse (55243012), we get a palindrome (76277267).

The spelling of 21034255 in words is "twenty-one million, thirty-four thousand, two hundred fifty-five".