21275046 has 96 divisors (see below), whose sum is σ = 53464320. Its totient is φ = 6063552.

The previous prime is 21275039. The next prime is 21275053. The reversal of 21275046 is 64057212.

It is an interprime number because it is at equal distance from previous prime (21275039) and next prime (21275053).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 317505 + ... + 317571.

It is an arithmetic number, because the mean of its divisors is an integer number (556920).

It is a vampire number, since it can be written as 4071 ⋅ 5226 (with its own digits).

Almost surely, 2^21275046 is an apocalyptic number.

21275046 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21275046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26732160).

21275046 is an abundant number, since it is smaller than the sum of its proper divisors (32189274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21275046 is a wasteful number, since it uses less digits than its factorization.

21275046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 21275046 is about 4612.4880487650. The cubic root of 21275046 is about 277.0916907247.

The spelling of 21275046 in words is "twenty-one million, two hundred seventy-five thousand, forty-six".