21102022022121 has 6 divisors (see below), whose sum is σ = 30480698476410. Its totient is φ = 14068014681408.

The previous prime is 21102022022087. The next prime is 21102022022143. The reversal of 21102022022121 is 12122022020112.

It is a happy number.

21102022022121 is a `hidden beast` number, since 211 + 0 + 20 + 220 + 2 + 212 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19153192062096 + 1948829960025 = 4376436^2 + 1396005^2 .

It is not a de Polignac number, because 21102022022121 - 2⁹ = 21102022021609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102022022094 and 21102022022103.

It is not an unprimeable number, because it can be changed into a prime (21102022012121) 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, 1172334556776 + ... + 1172334556793.

It is an arithmetic number, because the mean of its divisors is an integer number (5080116412735).

Almost surely, 2^{21102022022121} is an apocalyptic number.

It is an amenable number.

21102022022121 is a deficient number, since it is larger than the sum of its proper divisors (9378676454289).

21102022022121 is a wasteful number, since it uses less digits than its factorization.

21102022022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344669113575 (or 2344669113572 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21102022022121 its reverse (12122022020112), we get a palindrome (33224044042233).

The spelling of 21102022022121 in words is "twenty-one trillion, one hundred two billion, twenty-two million, twenty-two thousand, one hundred twenty-one".