21121034442 has 16 divisors (see below), whose sum is σ = 42245279040. Its totient is φ = 7039809792.

The previous prime is 21121034437. The next prime is 21121034471. The reversal of 21121034442 is 24443012112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43543 + ... + 210090.

It is an arithmetic number, because the mean of its divisors is an integer number (2640329940).

Almost surely, 2^21121034442 is an apocalyptic number.

21121034442 is an abundant number, since it is smaller than the sum of its proper divisors (21124244598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121034442 is a wasteful number, since it uses less digits than its factorization.

21121034442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267517.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21121034442 its reverse (24443012112), we get a palindrome (45564046554).

The spelling of 21121034442 in words is "twenty-one billion, one hundred twenty-one million, thirty-four thousand, four hundred forty-two".