21371901 has 8 divisors (see below), whose sum is σ = 28661280. Its totient is φ = 14165232.

The previous prime is 21371893. The next prime is 21371929. The reversal of 21371901 is 10917312.

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

It is not a de Polignac number, because 21371901 - 2³ = 21371893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371971) 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, 20071 + ... + 21108.

It is an arithmetic number, because the mean of its divisors is an integer number (3582660).

Almost surely, 2^21371901 is an apocalyptic number.

It is an amenable number.

21371901 is a deficient number, since it is larger than the sum of its proper divisors (7289379).

21371901 is a wasteful number, since it uses less digits than its factorization.

21371901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41355.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 21371901 is about 4622.9753406221. The cubic root of 21371901 is about 277.5115424141.

The spelling of 21371901 in words is "twenty-one million, three hundred seventy-one thousand, nine hundred one".