122021111111021 has 4 divisors (see below), whose sum is σ = 122071181327292. Its totient is φ = 121971040894752.

The previous prime is 122021111110991. The next prime is 122021111111023. The reversal of 122021111111021 is 120111111120221.

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 87778367118121 + 34242743992900 = 9369011^2 + 5851730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122021111111021 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 (122021111111023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25035104480 + ... + 25035109353.

It is an arithmetic number, because the mean of its divisors is an integer number (30517795331823).

Almost surely, 2^{122021111111021} is an apocalyptic number.

It is an amenable number.

122021111111021 is a deficient number, since it is larger than the sum of its proper divisors (50070216271).

122021111111021 is an equidigital number, since it uses as much as digits as its factorization.

122021111111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50070216270.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 122021111111021 its reverse (120111111120221), we get a palindrome (242132222231242).

The spelling of 122021111111021 in words is "one hundred twenty-two trillion, twenty-one billion, one hundred eleven million, one hundred eleven thousand, twenty-one".