22121661007 has 4 divisors (see below), whose sum is σ = 22187304256. Its totient is φ = 22056017760.

The previous prime is 22121660969. The next prime is 22121661011. The reversal of 22121661007 is 70016612122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70016612122 = 2 ⋅35008306061.

It is a cyclic number.

It is not a de Polignac number, because 22121661007 - 2¹¹ = 22121658959 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 (22121661097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32821119 + ... + 32821792.

It is an arithmetic number, because the mean of its divisors is an integer number (5546826064).

Almost surely, 2^22121661007 is an apocalyptic number.

22121661007 is a deficient number, since it is larger than the sum of its proper divisors (65643249).

22121661007 is an equidigital number, since it uses as much as digits as its factorization.

22121661007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65643248.

The product of its (nonzero) digits is 2016, while the sum is 28.

The spelling of 22121661007 in words is "twenty-two billion, one hundred twenty-one million, six hundred sixty-one thousand, seven".