21131451330 has 32 divisors (see below), whose sum is σ = 55325982528. Its totient is φ = 5122776000.

The previous prime is 21131451311. The next prime is 21131451371. The reversal of 21131451330 is 3315413112.

It is a self number, because there is not a number n which added to its sum of digits gives 21131451330.

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 15 ways as a sum of consecutive naturals, for example, 32017021 + ... + 32017680.

It is an arithmetic number, because the mean of its divisors is an integer number (1728936954).

Almost surely, 2^21131451330 is an apocalyptic number.

21131451330 is an abundant number, since it is smaller than the sum of its proper divisors (34194531198).

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

21131451330 is a wasteful number, since it uses less digits than its factorization.

21131451330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64034722.

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 21131451330 its reverse (3315413112), we get a palindrome (24446864442).

The spelling of 21131451330 in words is "twenty-one billion, one hundred thirty-one million, four hundred fifty-one thousand, three hundred thirty".