21971414 has 8 divisors (see below), whose sum is σ = 33847968. Its totient is φ = 10688760.

The previous prime is 21971413. The next prime is 21971437. The reversal of 21971414 is 41417912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21971413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148382 + ... + 148529.

It is an arithmetic number, because the mean of its divisors is an integer number (4230996).

Almost surely, 2^21971414 is an apocalyptic number.

21971414 is a deficient number, since it is larger than the sum of its proper divisors (11876554).

21971414 is a wasteful number, since it uses less digits than its factorization.

21971414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296950.

The product of its digits is 2016, while the sum is 29.

The square root of 21971414 is about 4687.3674914604. The cubic root of 21971414 is about 280.0825181959.

The spelling of 21971414 in words is "twenty-one million, nine hundred seventy-one thousand, four hundred fourteen".