21020222111121 has 6 divisors (see below), whose sum is σ = 30362543049410. Its totient is φ = 14013481407408.

The previous prime is 21020222111099. The next prime is 21020222111129. The reversal of 21020222111121 is 12111122202012.

21020222111121 is a `hidden beast` number, since 210 + 2 + 0 + 222 + 111 + 121 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20195685469521 + 824536641600 = 4493961^2 + 908040^2 .

It is not a de Polignac number, because 21020222111121 - 2¹⁴ = 21020222094737 is a prime.

It is a super-3 number, since 3×21020222111121³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020222111094 and 21020222111103.

It is not an unprimeable number, because it can be changed into a prime (21020222111129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167790117276 + ... + 1167790117293.

Almost surely, 2^{21020222111121} is an apocalyptic number.

It is an amenable number.

21020222111121 is a deficient number, since it is larger than the sum of its proper divisors (9342320938289).

21020222111121 is a wasteful number, since it uses less digits than its factorization.

21020222111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335580234575 (or 2335580234572 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21020222111121 its reverse (12111122202012), we get a palindrome (33131344313133).

The spelling of 21020222111121 in words is "twenty-one trillion, twenty billion, two hundred twenty-two million, one hundred eleven thousand, one hundred twenty-one".