221121012929 has 2 divisors, whose sum is σ = 221121012930. Its totient is φ = 221121012928.

The previous prime is 221121012923. The next prime is 221121012949. The reversal of 221121012929 is 929210121122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210357987904 + 10763025025 = 458648^2 + 103745^2 .

It is a cyclic number.

It is not a de Polignac number, because 221121012929 - 2⁴ = 221121012913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221121012895 and 221121012904.

It is not a weakly prime, because it can be changed into another prime (221121012923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560506464 + 110560506465.

It is an arithmetic number, because the mean of its divisors is an integer number (110560506465).

Almost surely, 2^221121012929 is an apocalyptic number.

It is an amenable number.

221121012929 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121012929 is an equidigital number, since it uses as much as digits as its factorization.

221121012929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 221121012929 in words is "two hundred twenty-one billion, one hundred twenty-one million, twelve thousand, nine hundred twenty-nine".