221221011936 has 48 divisors (see below), whose sum is σ = 582863979600. Its totient is φ = 73466201088.

The previous prime is 221221011931. The next prime is 221221011937. The reversal of 221221011936 is 639110122122.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×221221011936² (a number of 23 digits) contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221011931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4257421 + ... + 4309068.

It is an arithmetic number, because the mean of its divisors is an integer number (12142999575).

Almost surely, 2^221221011936 is an apocalyptic number.

It is an amenable number.

221221011936 is an abundant number, since it is smaller than the sum of its proper divisors (361642967664).

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

221221011936 is a wasteful number, since it uses less digits than its factorization.

221221011936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8566771 (or 8566763 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The spelling of 221221011936 in words is "two hundred twenty-one billion, two hundred twenty-one million, eleven thousand, nine hundred thirty-six".