21111022242 has 48 divisors (see below), whose sum is σ = 46972179072. Its totient is φ = 6849182880.

The previous prime is 21111022223. The next prime is 21111022249. The reversal of 21111022242 is 24222011112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21111022249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84193 + ... + 222059.

It is an arithmetic number, because the mean of its divisors is an integer number (978587064).

Almost surely, 2^21111022242 is an apocalyptic number.

21111022242 is an abundant number, since it is smaller than the sum of its proper divisors (25861156830).

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

21111022242 is a wasteful number, since it uses less digits than its factorization.

21111022242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138103 (or 138100 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21111022242 its reverse (24222011112), we get a palindrome (45333033354).

The spelling of 21111022242 in words is "twenty-one billion, one hundred eleven million, twenty-two thousand, two hundred forty-two".