21130155354 has 32 divisors (see below), whose sum is σ = 52688180736. Its totient is φ = 5488351920.

The previous prime is 21130155353. The next prime is 21130155377. The reversal of 21130155354 is 45355103112.

It is not an unprimeable number, because it can be changed into a prime (21130155353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22867672 + ... + 22868595.

It is an arithmetic number, because the mean of its divisors is an integer number (1646505648).

Almost surely, 2^21130155354 is an apocalyptic number.

21130155354 is an abundant number, since it is smaller than the sum of its proper divisors (31558025382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21130155354 is a wasteful number, since it uses less digits than its factorization.

21130155354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45736290.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 21130155354 its reverse (45355103112), we get a palindrome (66485258466).

The spelling of 21130155354 in words is "twenty-one billion, one hundred thirty million, one hundred fifty-five thousand, three hundred fifty-four".