21201223120439 has 16 divisors (see below), whose sum is σ = 21248455753728. Its totient is φ = 21154061803392.

The previous prime is 21201223120411. The next prime is 21201223120457. The reversal of 21201223120439 is 93402132210212.

It is a cyclic number.

It is not a de Polignac number, because 21201223120439 - 2¹² = 21201223116343 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 (21201223126439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4103195234 + ... + 4103200400.

It is an arithmetic number, because the mean of its divisors is an integer number (1328028484608).

Almost surely, 2^{21201223120439} is an apocalyptic number.

21201223120439 is a deficient number, since it is larger than the sum of its proper divisors (47232633289).

21201223120439 is a wasteful number, since it uses less digits than its factorization.

21201223120439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10454.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21201223120439 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-three million, one hundred twenty thousand, four hundred thirty-nine".