21325944454 has 4 divisors (see below), whose sum is σ = 31988916684. Its totient is φ = 10662972226.

The previous prime is 21325944443. The next prime is 21325944461. The reversal of 21325944454 is 45444952312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21325944454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5331486112 + ... + 5331486115.

It is an arithmetic number, because the mean of its divisors is an integer number (7997229171).

Almost surely, 2^21325944454 is an apocalyptic number.

21325944454 is a deficient number, since it is larger than the sum of its proper divisors (10662972230).

21325944454 is a wasteful number, since it uses less digits than its factorization.

21325944454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10662972229.

The product of its digits is 691200, while the sum is 43.

The spelling of 21325944454 in words is "twenty-one billion, three hundred twenty-five million, nine hundred forty-four thousand, four hundred fifty-four".