21555400003 has 8 divisors (see below), whose sum is σ = 22707334400. Its totient is φ = 20405209608.

The previous prime is 21555400001. The next prime is 21555400067. The reversal of 21555400003 is 30000455512.

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 21555400003 - 2¹ = 21555400001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21555400001) 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, 410583 + ... + 460096.

It is an arithmetic number, because the mean of its divisors is an integer number (2838416800).

Almost surely, 2^21555400003 is an apocalyptic number.

21555400003 is a deficient number, since it is larger than the sum of its proper divisors (1151934397).

21555400003 is a wasteful number, since it uses less digits than its factorization.

21555400003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872001.

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

Adding to 21555400003 its reverse (30000455512), we get a palindrome (51555855515).

The spelling of 21555400003 in words is "twenty-one billion, five hundred fifty-five million, four hundred thousand, three".