221121100121021 has 16 divisors (see below), whose sum is σ = 231194440962048. Its totient is φ = 211086312822000.

The previous prime is 221121100120979. The next prime is 221121100121023. The reversal of 221121100121021 is 120121001121122.

It is a cyclic number.

It is not a de Polignac number, because 221121100121021 - 2⁶ = 221121100120957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121100121023) 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, 32715596 + ... + 38891546.

It is an arithmetic number, because the mean of its divisors is an integer number (14449652560128).

Almost surely, 2^{221121100121021} is an apocalyptic number.

It is an amenable number.

221121100121021 is a deficient number, since it is larger than the sum of its proper divisors (10073340841027).

221121100121021 is a wasteful number, since it uses less digits than its factorization.

221121100121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6179072.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221121100121021 its reverse (120121001121122), we get a palindrome (341242101242143).

The spelling of 221121100121021 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, twenty-one".