21199527 has 12 divisors (see below), whose sum is σ = 32423040. Its totient is φ = 13301568.

The previous prime is 21199499. The next prime is 21199531. The reversal of 21199527 is 72599112.

It is not a de Polignac number, because 21199527 - 2¹⁰ = 21198503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21199491 and 21199500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21199547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69127 + ... + 69432.

It is an arithmetic number, because the mean of its divisors is an integer number (2701920).

Almost surely, 2^21199527 is an apocalyptic number.

21199527 is a deficient number, since it is larger than the sum of its proper divisors (11223513).

21199527 is a wasteful number, since it uses less digits than its factorization.

21199527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138582 (or 138579 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 21199527 is about 4604.2944084843. The cubic root of 21199527 is about 276.7634423790.

The spelling of 21199527 in words is "twenty-one million, one hundred ninety-nine thousand, five hundred twenty-seven".