22015255121 has 4 divisors (see below), whose sum is σ = 22242216612. Its totient is φ = 21788293632.

The previous prime is 22015255117. The next prime is 22015255133. The reversal of 22015255121 is 12155251022.

It is a happy number.

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 11134470400 + 10880784721 = 105520^2 + 104311^2 .

It is a cyclic number.

It is not a de Polignac number, because 22015255121 - 2² = 22015255117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22015255021) 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, 113480600 + ... + 113480793.

It is an arithmetic number, because the mean of its divisors is an integer number (5560554153).

Almost surely, 2^22015255121 is an apocalyptic number.

It is an amenable number.

22015255121 is a deficient number, since it is larger than the sum of its proper divisors (226961491).

22015255121 is an equidigital number, since it uses as much as digits as its factorization.

22015255121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226961490.

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 22015255121 in words is "twenty-two billion, fifteen million, two hundred fifty-five thousand, one hundred twenty-one".