21341901 has 24 divisors (see below), whose sum is σ = 33816960. Its totient is φ = 11932032.

The previous prime is 21341897. The next prime is 21341911. The reversal of 21341901 is 10914312.

It is not a de Polignac number, because 21341901 - 2² = 21341897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341911) 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 23 ways as a sum of consecutive naturals, for example, 5365 + ... + 8453.

It is an arithmetic number, because the mean of its divisors is an integer number (1409040).

Almost surely, 2^21341901 is an apocalyptic number.

21341901 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21341901 is a deficient number, since it is larger than the sum of its proper divisors (12475059).

21341901 is a wasteful number, since it uses less digits than its factorization.

21341901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3153 (or 3146 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21341901 is about 4619.7295375379. The cubic root of 21341901 is about 277.3816328228.

The spelling of 21341901 in words is "twenty-one million, three hundred forty-one thousand, nine hundred one".