21338222651 has 2 divisors, whose sum is σ = 21338222652. Its totient is φ = 21338222650.

The previous prime is 21338222597. The next prime is 21338222713. The reversal of 21338222651 is 15622283312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21338222651 - 2²² = 21334028347 is a prime.

It is not a weakly prime, because it can be changed into another prime (21338222051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10669111325 + 10669111326.

It is an arithmetic number, because the mean of its divisors is an integer number (10669111326).

Almost surely, 2^21338222651 is an apocalyptic number.

21338222651 is a deficient number, since it is larger than the sum of its proper divisors (1).

21338222651 is an equidigital number, since it uses as much as digits as its factorization.

21338222651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The spelling of 21338222651 in words is "twenty-one billion, three hundred thirty-eight million, two hundred twenty-two thousand, six hundred fifty-one".