21442023415021 has 16 divisors (see below), whose sum is σ = 24626965930560. Its totient is φ = 18463404401280.

The previous prime is 21442023415009. The next prime is 21442023415129. The reversal of 21442023415021 is 12051432024412.

It is a cyclic number.

It is not a de Polignac number, because 21442023415021 - 2⁹ = 21442023414509 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 (21442023415621) 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, 8337426 + ... + 10601731.

It is an arithmetic number, because the mean of its divisors is an integer number (1539185370660).

Almost surely, 2^{21442023415021} is an apocalyptic number.

It is an amenable number.

21442023415021 is a deficient number, since it is larger than the sum of its proper divisors (3184942515539).

21442023415021 is a wasteful number, since it uses less digits than its factorization.

21442023415021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18944604.

The product of its (nonzero) digits is 15360, while the sum is 31.

Adding to 21442023415021 its reverse (12051432024412), we get a palindrome (33493455439433).

The spelling of 21442023415021 in words is "twenty-one trillion, four hundred forty-two billion, twenty-three million, four hundred fifteen thousand, twenty-one".