21271194 has 48 divisors (see below), whose sum is σ = 54993600. Its totient is φ = 6076728.

The previous prime is 21271183. The next prime is 21271207. The reversal of 21271194 is 49117212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1374 + ... + 6665.

It is an arithmetic number, because the mean of its divisors is an integer number (1145700).

Almost surely, 2^21271194 is an apocalyptic number.

21271194 is an abundant number, since it is smaller than the sum of its proper divisors (33722406).

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

21271194 is a wasteful number, since it uses less digits than its factorization.

21271194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8064 (or 8051 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 21271194 is about 4612.0704678051. The cubic root of 21271194 is about 277.0749665679.

It can be divided in two parts, 2127 and 1194, that added together give a triangular number (3321 = T₈₁).

The spelling of 21271194 in words is "twenty-one million, two hundred seventy-one thousand, one hundred ninety-four".