21213600661050 has 192 divisors, whose sum is σ = 63346325099520. Its totient is φ = 4589526458880.

The previous prime is 21213600660997. The next prime is 21213600661061. The reversal of 21213600661050 is 5016600631212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21930414 + ... + 22877286.

It is an arithmetic number, because the mean of its divisors is an integer number (329928776560).

Almost surely, 2^{21213600661050} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213600661050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31673162549760).

21213600661050 is an abundant number, since it is smaller than the sum of its proper divisors (42132724438470).

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

21213600661050 is a wasteful number, since it uses less digits than its factorization.

21213600661050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948037 (or 948032 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 21213600661050 in words is "twenty-one trillion, two hundred thirteen billion, six hundred million, six hundred sixty-one thousand, fifty".