221011001010 has 64 divisors (see below), whose sum is σ = 589404816000. Its totient is φ = 58932052416.

The previous prime is 221011000961. The next prime is 221011001017. The reversal of 221011001010 is 10100110122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 221011000983 and 221011001001.

It is not an unprimeable number, because it can be changed into a prime (221011001017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6219012 + ... + 6254448.

It is an arithmetic number, because the mean of its divisors is an integer number (9209450250).

Almost surely, 2^221011001010 is an apocalyptic number.

221011001010 is an abundant number, since it is smaller than the sum of its proper divisors (368393814990).

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

221011001010 is a wasteful number, since it uses less digits than its factorization.

221011001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58552 (or 58546 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 221011001010 its reverse (10100110122), we get a palindrome (231111111132).

The spelling of 221011001010 in words is "two hundred twenty-one billion, eleven million, one thousand, ten".