21031022220041 has 4 divisors (see below), whose sum is σ = 21083997087492. Its totient is φ = 20978047352592.

The previous prime is 21031022220029. The next prime is 21031022220067. The reversal of 21031022220041 is 14002222013012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6610555210000 + 14420467010041 = 2571100^2 + 3797429^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031022220041 - 2¹⁰ = 21031022219017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031022219995 and 21031022220022.

It is not an unprimeable number, because it can be changed into a prime (21031022220841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26487433130 + ... + 26487433923.

It is an arithmetic number, because the mean of its divisors is an integer number (5270999271873).

Almost surely, 2^{21031022220041} is an apocalyptic number.

It is an amenable number.

21031022220041 is a deficient number, since it is larger than the sum of its proper divisors (52974867451).

21031022220041 is an equidigital number, since it uses as much as digits as its factorization.

21031022220041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52974867450.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21031022220041 its reverse (14002222013012), we get a palindrome (35033244233053).

The spelling of 21031022220041 in words is "twenty-one trillion, thirty-one billion, twenty-two million, two hundred twenty thousand, forty-one".