21122225407 has 2 divisors, whose sum is σ = 21122225408. Its totient is φ = 21122225406.

The previous prime is 21122225401. The next prime is 21122225419. The reversal of 21122225407 is 70452222112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21122225407 - 2¹⁵ = 21122192639 is a prime.

It is a super-2 number, since 2×21122225407² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122225401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561112703 + 10561112704.

It is an arithmetic number, because the mean of its divisors is an integer number (10561112704).

Almost surely, 2^21122225407 is an apocalyptic number.

21122225407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122225407 is an equidigital number, since it uses as much as digits as its factorization.

21122225407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 28.

Adding to 21122225407 its reverse (70452222112), we get a palindrome (91574447519).

The spelling of 21122225407 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-five thousand, four hundred seven".