21901351 has 8 divisors (see below), whose sum is σ = 22708800. Its totient is φ = 21097440.

The previous prime is 21901291. The next prime is 21901381. The reversal of 21901351 is 15310912.

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

It is a cyclic number.

It is not a de Polignac number, because 21901351 - 2¹¹ = 21899303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21901381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23586 + ... + 24496.

It is an arithmetic number, because the mean of its divisors is an integer number (2838600).

Almost surely, 2^21901351 is an apocalyptic number.

21901351 is a deficient number, since it is larger than the sum of its proper divisors (807449).

21901351 is an equidigital number, since it uses as much as digits as its factorization.

21901351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 21901351 is about 4679.8879260085. The cubic root of 21901351 is about 279.7844897810.

The spelling of 21901351 in words is "twenty-one million, nine hundred one thousand, three hundred fifty-one".