21223932206387 has 2 divisors, whose sum is σ = 21223932206388. Its totient is φ = 21223932206386.

The previous prime is 21223932206359. The next prime is 21223932206429. The reversal of 21223932206387 is 78360223932212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21223932206387 - 2²² = 21223928012083 is a prime.

It is a super-2 number, since 2×21223932206387² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21223932205387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611966103193 + 10611966103194.

It is an arithmetic number, because the mean of its divisors is an integer number (10611966103194).

Almost surely, 2^{21223932206387} is an apocalyptic number.

21223932206387 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223932206387 is an equidigital number, since it uses as much as digits as its factorization.

21223932206387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 50.

The spelling of 21223932206387 in words is "twenty-one trillion, two hundred twenty-three billion, nine hundred thirty-two million, two hundred six thousand, three hundred eighty-seven".