21111023242 has 4 divisors (see below), whose sum is σ = 31666534866. Its totient is φ = 10555511620.

The previous prime is 21111023239. The next prime is 21111023261. The reversal of 21111023242 is 24232011112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13926596121 + 7184427121 = 118011^2 + 84761^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277755809 + ... + 5277755812.

Almost surely, 2^21111023242 is an apocalyptic number.

21111023242 is a deficient number, since it is larger than the sum of its proper divisors (10555511624).

21111023242 is a wasteful number, since it uses less digits than its factorization.

21111023242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555511623.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21111023242 its reverse (24232011112), we get a palindrome (45343034354).

The spelling of 21111023242 in words is "twenty-one billion, one hundred eleven million, twenty-three thousand, two hundred forty-two".