21441025442421 has 128 divisors (see below), whose sum is σ = 34993353024000. Its totient is φ = 12893631528960.

The previous prime is 21441025442401. The next prime is 21441025442429. The reversal of 21441025442421 is 12424452014412.

21441025442421 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 102 + 544 + 2 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 21441025442421 - 2⁶ = 21441025442357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441025442429) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5454341826 + ... + 5454345756.

It is an arithmetic number, because the mean of its divisors is an integer number (273385570500).

Almost surely, 2^{21441025442421} is an apocalyptic number.

It is an amenable number.

21441025442421 is a deficient number, since it is larger than the sum of its proper divisors (13552327581579).

21441025442421 is a wasteful number, since it uses less digits than its factorization.

21441025442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5108 (or 5102 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 36.

Adding to 21441025442421 its reverse (12424452014412), we get a palindrome (33865477456833).

The spelling of 21441025442421 in words is "twenty-one trillion, four hundred forty-one billion, twenty-five million, four hundred forty-two thousand, four hundred twenty-one".