21442021041 has 16 divisors (see below), whose sum is σ = 32677599104. Its totient is φ = 12251067264.

The previous prime is 21442021031. The next prime is 21442021061. The reversal of 21442021041 is 14012024412.

It is not a de Polignac number, because 21442021041 - 2⁷ = 21442020913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21442020999 and 21442021017.

It is not an unprimeable number, because it can be changed into a prime (21442021031) 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, 123381 + ... + 241053.

It is an arithmetic number, because the mean of its divisors is an integer number (2042349944).

Almost surely, 2^21442021041 is an apocalyptic number.

21442021041 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21442021041 is a deficient number, since it is larger than the sum of its proper divisors (11235578063).

21442021041 is a wasteful number, since it uses less digits than its factorization.

21442021041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126360.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21442021041 its reverse (14012024412), we get a palindrome (35454045453).

The spelling of 21442021041 in words is "twenty-one billion, four hundred forty-two million, twenty-one thousand, forty-one".