21011101242 has 32 divisors (see below), whose sum is σ = 42800335872. Its totient is φ = 6874751664.

The previous prime is 21011101231. The next prime is 21011101259. The reversal of 21011101242 is 24210111012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21423 + ... + 206109.

It is an arithmetic number, because the mean of its divisors is an integer number (1337510496).

Almost surely, 2^21011101242 is an apocalyptic number.

21011101242 is an abundant number, since it is smaller than the sum of its proper divisors (21789234630).

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

21011101242 is a wasteful number, since it uses less digits than its factorization.

21011101242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185042.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21011101242 its reverse (24210111012), we get a palindrome (45221212254).

The spelling of 21011101242 in words is "twenty-one billion, eleven million, one hundred one thousand, two hundred forty-two".