21272349 has 16 divisors (see below), whose sum is σ = 32721408. Its totient is φ = 12040752.

The previous prime is 21272333. The next prime is 21272351. The reversal of 21272349 is 94327212.

It is not a de Polignac number, because 21272349 - 2⁴ = 21272333 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21272359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2487 + ... + 6980.

It is an arithmetic number, because the mean of its divisors is an integer number (2045088).

Almost surely, 2^21272349 is an apocalyptic number.

It is an amenable number.

21272349 is a deficient number, since it is larger than the sum of its proper divisors (11449059).

21272349 is a wasteful number, since it uses less digits than its factorization.

21272349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9584.

The product of its digits is 6048, while the sum is 30.

The square root of 21272349 is about 4612.1956810179. The cubic root of 21272349 is about 277.0799814219.

The spelling of 21272349 in words is "twenty-one million, two hundred seventy-two thousand, three hundred forty-nine".