21130356154 has 8 divisors (see below), whose sum is σ = 31791292128. Its totient is φ = 10533258780.

The previous prime is 21130356113. The next prime is 21130356161. The reversal of 21130356154 is 45165303112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15958822 + ... + 15960145.

It is an arithmetic number, because the mean of its divisors is an integer number (3973911516).

Almost surely, 2^21130356154 is an apocalyptic number.

21130356154 is a deficient number, since it is larger than the sum of its proper divisors (10660935974).

21130356154 is a wasteful number, since it uses less digits than its factorization.

21130356154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31919300.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 21130356154 its reverse (45165303112), we get a palindrome (66295659266).

The spelling of 21130356154 in words is "twenty-one billion, one hundred thirty million, three hundred fifty-six thousand, one hundred fifty-four".