221020212010000 has 400 divisors, whose sum is σ = 581807761920000. Its totient is φ = 80826100992000.

The previous prime is 221020212009967. The next prime is 221020212010001. The reversal of 221020212010000 is 10212020122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (400).

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (221020212010001) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 9889478826 + ... + 9889501174.

It is an arithmetic number, because the mean of its divisors is an integer number (1454519404800).

Almost surely, 2^{221020212010000} is an apocalyptic number.

221020212010000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221020212010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290903880960000).

221020212010000 is an abundant number, since it is smaller than the sum of its proper divisors (360787549910000).

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

221020212010000 is a wasteful number, since it uses less digits than its factorization.

221020212010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23116 (or 23095 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221020212010000 its reverse (10212020122), we get a palindrome (221030424030122).

The spelling of 221020212010000 in words is "two hundred twenty-one trillion, twenty billion, two hundred twelve million, ten thousand".