21895146 has 48 divisors (see below), whose sum is σ = 58391424. Its totient is φ = 5774112.

The previous prime is 21895123. The next prime is 21895147. The reversal of 21895146 is 64159812.

21895146 = T₁₂₆₀ + T₁₂₆₁ + ... + T₁₂₈₆.

It is a super-2 number, since 2×21895146² = 958794836722632, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21895146.

It is not an unprimeable number, because it can be changed into a prime (21895147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5046 + ... + 8321.

It is an arithmetic number, because the mean of its divisors is an integer number (1216488).

Almost surely, 2^21895146 is an apocalyptic number.

21895146 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21895146 is an abundant number, since it is smaller than the sum of its proper divisors (36496278).

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

21895146 is a wasteful number, since it uses less digits than its factorization.

21895146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13395 (or 13392 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 21895146 is about 4679.2249358200. The cubic root of 21895146 is about 279.7580648246.

The spelling of 21895146 in words is "twenty-one million, eight hundred ninety-five thousand, one hundred forty-six".