21030055262503 has 4 divisors (see below), whose sum is σ = 24034348871440. Its totient is φ = 18025761653568.

The previous prime is 21030055262393. The next prime is 21030055262569. The reversal of 21030055262503 is 30526255003012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21030055262503 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 (21030055262303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1502146804458 + ... + 1502146804471.

It is an arithmetic number, because the mean of its divisors is an integer number (6008587217860).

Almost surely, 2^{21030055262503} is an apocalyptic number.

21030055262503 is a deficient number, since it is larger than the sum of its proper divisors (3004293608937).

21030055262503 is an equidigital number, since it uses as much as digits as its factorization.

21030055262503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004293608936.

The product of its (nonzero) digits is 54000, while the sum is 34.

The spelling of 21030055262503 in words is "twenty-one trillion, thirty billion, fifty-five million, two hundred sixty-two thousand, five hundred three".