121221000022 has 4 divisors (see below), whose sum is σ = 181831500036. Its totient is φ = 60610500010.

The previous prime is 121220999971. The next prime is 121221000023. The reversal of 121221000022 is 220000122121.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 121220999966 and 121221000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221000023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30305250004 + ... + 30305250007.

It is an arithmetic number, because the mean of its divisors is an integer number (45457875009).

Almost surely, 2^121221000022 is an apocalyptic number.

121221000022 is a deficient number, since it is larger than the sum of its proper divisors (60610500014).

121221000022 is an equidigital number, since it uses as much as digits as its factorization.

121221000022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60610500013.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121221000022 its reverse (220000122121), we get a palindrome (341221122143).

The spelling of 121221000022 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty-two", and thus it is an aban number.