1021221110021 has 8 divisors (see below), whose sum is σ = 1217853746304. Its totient is φ = 837274450320.

The previous prime is 1021221110009. The next prime is 1021221110047. The reversal of 1021221110021 is 1200111221201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021221110021 - 2²² = 1021216915717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021221109978 and 1021221110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021221110621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3171493970 + ... + 3171494291.

It is an arithmetic number, because the mean of its divisors is an integer number (152231718288).

Almost surely, 2^{1021221110021} is an apocalyptic number.

It is an amenable number.

1021221110021 is a deficient number, since it is larger than the sum of its proper divisors (196632636283).

1021221110021 is an equidigital number, since it uses as much as digits as its factorization.

1021221110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6342988291.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021221110021 its reverse (1200111221201), we get a palindrome (2221332331222).

The spelling of 1021221110021 in words is "one trillion, twenty-one billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".