221021101121010 has 64 divisors (see below), whose sum is σ = 530654061587328. Its totient is φ = 58916361705984.

The previous prime is 221021101121003. The next prime is 221021101121063. The reversal of 221021101121010 is 10121101120122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 31 ways as a sum of consecutive naturals, for example, 1074886869 + ... + 1075092471.

It is an arithmetic number, because the mean of its divisors is an integer number (8291469712302).

Almost surely, 2^{221021101121010} is an apocalyptic number.

221021101121010 is an abundant number, since it is smaller than the sum of its proper divisors (309632960466318).

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

221021101121010 is a wasteful number, since it uses less digits than its factorization.

221021101121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219179.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221021101121010 its reverse (10121101120122), we get a palindrome (231142202241132).

The spelling of 221021101121010 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred one million, one hundred twenty-one thousand, ten".