21534194 has 16 divisors (see below), whose sum is σ = 35604576. Its totient is φ = 9686400.

The previous prime is 21534179. The next prime is 21534199. The reversal of 21534194 is 49143512.

It is a super-2 number, since 2×21534194² = 927443022459272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21534199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2912 + ... + 7179.

It is an arithmetic number, because the mean of its divisors is an integer number (2225286).

Almost surely, 2^21534194 is an apocalyptic number.

21534194 is a deficient number, since it is larger than the sum of its proper divisors (14070382).

21534194 is a wasteful number, since it uses less digits than its factorization.

21534194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10201.

The product of its digits is 4320, while the sum is 29.

The square root of 21534194 is about 4640.4950166981. The cubic root of 21534194 is about 278.2122234360.

The spelling of 21534194 in words is "twenty-one million, five hundred thirty-four thousand, one hundred ninety-four".