21442053004 has 24 divisors (see below), whose sum is σ = 38230642800. Its totient is φ = 10520746944.

The previous prime is 21442052987. The next prime is 21442053007. The reversal of 21442053004 is 40035024412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21442053004.

It is not an unprimeable number, because it can be changed into a prime (21442053007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167259 + ... + 266194.

It is an arithmetic number, because the mean of its divisors is an integer number (1592943450).

Almost surely, 2^21442053004 is an apocalyptic number.

It is an amenable number.

21442053004 is a deficient number, since it is larger than the sum of its proper divisors (16788589796).

21442053004 is a wasteful number, since it uses less digits than its factorization.

21442053004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433689 (or 433687 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21442053004 its reverse (40035024412), we get a palindrome (61477077416).

The spelling of 21442053004 in words is "twenty-one billion, four hundred forty-two million, fifty-three thousand, four".