21306711441630 has 128 divisors (see below), whose sum is σ = 52999315307136. Its totient is φ = 5477610700800.

The previous prime is 21306711441553. The next prime is 21306711441643. The reversal of 21306711441630 is 3614411760312.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 434088690 + ... + 434137770.

It is an arithmetic number, because the mean of its divisors is an integer number (414057150837).

Almost surely, 2^{21306711441630} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21306711441630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26499657653568).

21306711441630 is an abundant number, since it is smaller than the sum of its proper divisors (31692603865506).

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

21306711441630 is a wasteful number, since it uses less digits than its factorization.

21306711441630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52702.

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 21306711441630 in words is "twenty-one trillion, three hundred six billion, seven hundred eleven million, four hundred forty-one thousand, six hundred thirty".