21131022142439 has 16 divisors (see below), whose sum is σ = 23224665026304. Its totient is φ = 19066469990400.

The previous prime is 21131022142403. The next prime is 21131022142441. The reversal of 21131022142439 is 93424122013112.

It is a cyclic number.

It is not a de Polignac number, because 21131022142439 - 2¹⁶ = 21131022076903 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21131022142399 and 21131022142408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131022142939) 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, 6598682 + ... + 9263079.

It is an arithmetic number, because the mean of its divisors is an integer number (1451541564144).

Almost surely, 2^{21131022142439} is an apocalyptic number.

21131022142439 is a deficient number, since it is larger than the sum of its proper divisors (2093642883865).

21131022142439 is a wasteful number, since it uses less digits than its factorization.

21131022142439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15862678.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 21131022142439 in words is "twenty-one trillion, one hundred thirty-one billion, twenty-two million, one hundred forty-two thousand, four hundred thirty-nine".