21130215454 has 8 divisors (see below), whose sum is σ = 32009138568. Its totient is φ = 10460502600.

The previous prime is 21130215401. The next prime is 21130215461. The reversal of 21130215454 is 45451203112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21130215454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52302312 + ... + 52302715.

It is an arithmetic number, because the mean of its divisors is an integer number (4001142321).

Almost surely, 2^21130215454 is an apocalyptic number.

21130215454 is a deficient number, since it is larger than the sum of its proper divisors (10878923114).

21130215454 is a wasteful number, since it uses less digits than its factorization.

21130215454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104605130.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21130215454 its reverse (45451203112), we get a palindrome (66581418566).

The spelling of 21130215454 in words is "twenty-one billion, one hundred thirty million, two hundred fifteen thousand, four hundred fifty-four".