21554053 has 8 divisors (see below), whose sum is σ = 21930048. Its totient is φ = 21180384.

The previous prime is 21554041. The next prime is 21554063. The reversal of 21554053 is 35045512.

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 21554053 - 2²¹ = 19456901 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 (21554033) 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, 36426 + ... + 37012.

It is an arithmetic number, because the mean of its divisors is an integer number (2741256).

Almost surely, 2^21554053 is an apocalyptic number.

It is an amenable number.

21554053 is a deficient number, since it is larger than the sum of its proper divisors (375995).

21554053 is an equidigital number, since it uses as much as digits as its factorization.

21554053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 21554053 is about 4642.6342737717. The cubic root of 21554053 is about 278.2977203131.

Adding to 21554053 its reverse (35045512), we get a palindrome (56599565).

The spelling of 21554053 in words is "twenty-one million, five hundred fifty-four thousand, fifty-three".