221121000021021 has 16 divisors (see below), whose sum is σ = 294901134792000. Its totient is φ = 147377435655168.

The previous prime is 221121000021011. The next prime is 221121000021037. The reversal of 221121000021021 is 120120000121122.

It is not a de Polignac number, because 221121000021021 - 2¹⁴ = 221121000004637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121000021001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302163315 + ... + 302894223.

It is an arithmetic number, because the mean of its divisors is an integer number (18431320924500).

Almost surely, 2^{221121000021021} is an apocalyptic number.

It is an amenable number.

221121000021021 is a deficient number, since it is larger than the sum of its proper divisors (73780134770979).

221121000021021 is a wasteful number, since it uses less digits than its factorization.

221121000021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755788.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221121000021021 its reverse (120120000121122), we get a palindrome (341241000142143).

The spelling of 221121000021021 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twenty-one thousand, twenty-one".