21130026454 has 4 divisors (see below), whose sum is σ = 31695039684. Its totient is φ = 10565013226.

The previous prime is 21130026451. The next prime is 21130026499. The reversal of 21130026454 is 45462003112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130026451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5282506612 + ... + 5282506615.

It is an arithmetic number, because the mean of its divisors is an integer number (7923759921).

Almost surely, 2^21130026454 is an apocalyptic number.

21130026454 is a deficient number, since it is larger than the sum of its proper divisors (10565013230).

21130026454 is a wasteful number, since it uses less digits than its factorization.

21130026454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10565013229.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 21130026454 its reverse (45462003112), we get a palindrome (66592029566).

The spelling of 21130026454 in words is "twenty-one billion, one hundred thirty million, twenty-six thousand, four hundred fifty-four".