21121020222021 has 8 divisors (see below), whose sum is σ = 31290400328960. Its totient is φ = 14080680147996.

The previous prime is 21121020222019. The next prime is 21121020222059. The reversal of 21121020222021 is 12022202012112.

It is a happy number.

21121020222021 is a `hidden beast` number, since 2 + 11 + 210 + 202 + 220 + 21 = 666.

It is not a de Polignac number, because 21121020222021 - 2¹ = 21121020222019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121020221985 and 21121020222003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121020222091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391130004085 + ... + 391130004138.

It is an arithmetic number, because the mean of its divisors is an integer number (3911300041120).

Almost surely, 2^{21121020222021} is an apocalyptic number.

It is an amenable number.

21121020222021 is a deficient number, since it is larger than the sum of its proper divisors (10169380106939).

21121020222021 is an equidigital number, since it uses as much as digits as its factorization.

21121020222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782260008232 (or 782260008226 counting only the distinct ones).

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

Adding to 21121020222021 its reverse (12022202012112), we get a palindrome (33143222234133).

The spelling of 21121020222021 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred twenty-two thousand, twenty-one".