21630221172644 has 192 divisors, whose sum is σ = 47252931264000. Its totient is φ = 8629163311104.

The previous prime is 21630221172641. The next prime is 21630221172647. The reversal of 21630221172644 is 44627112203612.

It is an interprime number because it is at equal distance from previous prime (21630221172641) and next prime (21630221172647).

It is not an unprimeable number, because it can be changed into a prime (21630221172641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5785026527 + ... + 5785030265.

It is an arithmetic number, because the mean of its divisors is an integer number (246109017000).

Almost surely, 2^{21630221172644} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21630221172644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23626465632000).

21630221172644 is an abundant number, since it is smaller than the sum of its proper divisors (25622710091356).

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

21630221172644 is a wasteful number, since it uses less digits than its factorization.

21630221172644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435 (or 6419 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 21630221172644 in words is "twenty-one trillion, six hundred thirty billion, two hundred twenty-one million, one hundred seventy-two thousand, six hundred forty-four".