21121441042 has 16 divisors (see below), whose sum is σ = 34121888640. Its totient is φ = 9747603792.

The previous prime is 21121441031. The next prime is 21121441049. The reversal of 21121441042 is 24014412112.

It is a super-2 number, since 2×21121441042² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121441049) 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, 451509 + ... + 496087.

It is an arithmetic number, because the mean of its divisors is an integer number (2132618040).

Almost surely, 2^21121441042 is an apocalyptic number.

21121441042 is a deficient number, since it is larger than the sum of its proper divisors (13000447598).

21121441042 is a wasteful number, since it uses less digits than its factorization.

21121441042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62817.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21121441042 its reverse (24014412112), we get a palindrome (45135853154).

The spelling of 21121441042 in words is "twenty-one billion, one hundred twenty-one million, four hundred forty-one thousand, forty-two".