21155333130 has 48 divisors (see below), whose sum is σ = 55405386504. Its totient is φ = 5600240640.

The previous prime is 21155333119. The next prime is 21155333149. The reversal of 21155333130 is 3133355112.

21155333130 is a `hidden beast` number, since 2 + 115 + 533 + 3 + 13 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13199941881 + 7955391249 = 114891^2 + 89193^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21155333094 and 21155333103.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 845551 + ... + 870210.

Almost surely, 2^21155333130 is an apocalyptic number.

21155333130 is an abundant number, since it is smaller than the sum of its proper divisors (34250053374).

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

21155333130 is a wasteful number, since it uses less digits than its factorization.

21155333130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715911 (or 1715908 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 27.

Adding to 21155333130 its reverse (3133355112), we get a palindrome (24288688242).

The spelling of 21155333130 in words is "twenty-one billion, one hundred fifty-five million, three hundred thirty-three thousand, one hundred thirty".