21151334120 has 48 divisors (see below), whose sum is σ = 55360384740. Its totient is φ = 7251885312.

The previous prime is 21151334111. The next prime is 21151334161. The reversal of 21151334120 is 2143315112.

It can be written as a sum of positive squares in 2 ways, for example, as 17909398276 + 3241935844 = 133826^2 + 56938^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5393789 + ... + 5397708.

Almost surely, 2^21151334120 is an apocalyptic number.

21151334120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21151334120 is an abundant number, since it is smaller than the sum of its proper divisors (34209050620).

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

21151334120 is a wasteful number, since it uses less digits than its factorization.

21151334120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10791522 (or 10791511 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21151334120 its reverse (2143315112), we get a palindrome (23294649232).

The spelling of 21151334120 in words is "twenty-one billion, one hundred fifty-one million, three hundred thirty-four thousand, one hundred twenty".