21298128130 has 16 divisors (see below), whose sum is σ = 38675894904. Its totient is φ = 8443859200.

The previous prime is 21298128079. The next prime is 21298128143. The reversal of 21298128130 is 3182189212.

It can be written as a sum of positive squares in 4 ways, for example, as 5633853481 + 15664274649 = 75059^2 + 125157^2 .

It is a super-3 number, since 3×21298128130³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21298128130.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9422821 + ... + 9425080.

Almost surely, 2^21298128130 is an apocalyptic number.

21298128130 is a deficient number, since it is larger than the sum of its proper divisors (17377766774).

21298128130 is a wasteful number, since it uses less digits than its factorization.

21298128130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18848021.

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 21298128130 in words is "twenty-one billion, two hundred ninety-eight million, one hundred twenty-eight thousand, one hundred thirty".