21003630454 has 4 divisors (see below), whose sum is σ = 31505445684. Its totient is φ = 10501815226.

The previous prime is 21003630449. The next prime is 21003630457. The reversal of 21003630454 is 45403630012.

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

It is a super-2 number, since 2×21003630454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003630457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250907612 + ... + 5250907615.

It is an arithmetic number, because the mean of its divisors is an integer number (7876361421).

Almost surely, 2^21003630454 is an apocalyptic number.

21003630454 is a deficient number, since it is larger than the sum of its proper divisors (10501815230).

21003630454 is a wasteful number, since it uses less digits than its factorization.

21003630454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501815229.

The product of its (nonzero) digits is 8640, while the sum is 28.

The spelling of 21003630454 in words is "twenty-one billion, three million, six hundred thirty thousand, four hundred fifty-four".