21054201 has 16 divisors (see below), whose sum is σ = 32148864. Its totient is φ = 12006144.

The previous prime is 21054199. The next prime is 21054233. The reversal of 21054201 is 10245012.

It is not a de Polignac number, because 21054201 - 2¹ = 21054199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21054401) 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 15 ways as a sum of consecutive naturals, for example, 15585 + ... + 16881.

It is an arithmetic number, because the mean of its divisors is an integer number (2009304).

Almost surely, 2^21054201 is an apocalyptic number.

21054201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21054201 is a deficient number, since it is larger than the sum of its proper divisors (11094663).

21054201 is a wasteful number, since it uses less digits than its factorization.

21054201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21054201 is about 4588.4856979182. The cubic root of 21054201 is about 276.1295731655.

Adding to 21054201 its reverse (10245012), we get a palindrome (31299213).

The spelling of 21054201 in words is "twenty-one million, fifty-four thousand, two hundred one".