21260530661202 has 512 divisors, whose sum is σ = 60854105088000. Its totient is φ = 5364678574080.

The previous prime is 21260530661137. The next prime is 21260530661213. The reversal of 21260530661202 is 20216603506212.

21260530661202 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 0 + 5 + 30 + 6 + 612 + 0 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 828308773 + ... + 828334439.

It is an arithmetic number, because the mean of its divisors is an integer number (118855674000).

Almost surely, 2^{21260530661202} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21260530661202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30427052544000).

21260530661202 is an abundant number, since it is smaller than the sum of its proper divisors (39593574426798).

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

21260530661202 is a wasteful number, since it uses less digits than its factorization.

21260530661202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25871 (or 25865 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 21260530661202 in words is "twenty-one trillion, two hundred sixty billion, five hundred thirty million, six hundred sixty-one thousand, two hundred two".