21011113442 has 8 divisors (see below), whose sum is σ = 34381822032. Its totient is φ = 9550506100.

The previous prime is 21011113439. The next prime is 21011113451. The reversal of 21011113442 is 24431111012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477525284 + ... + 477525327.

It is an arithmetic number, because the mean of its divisors is an integer number (4297727754).

Almost surely, 2^21011113442 is an apocalyptic number.

21011113442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21011113442 is a deficient number, since it is larger than the sum of its proper divisors (13370708590).

21011113442 is a wasteful number, since it uses less digits than its factorization.

21011113442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955050624.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21011113442 its reverse (24431111012), we get a palindrome (45442224454).

The spelling of 21011113442 in words is "twenty-one billion, eleven million, one hundred thirteen thousand, four hundred forty-two".