21011121074 has 8 divisors (see below), whose sum is σ = 31987080048. Its totient is φ = 10348761060.

The previous prime is 21011121073. The next prime is 21011121127. The reversal of 21011121074 is 47012111012.

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

It is not an unprimeable number, because it can be changed into a prime (21011121073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78399572 + ... + 78399839.

It is an arithmetic number, because the mean of its divisors is an integer number (3998385006).

Almost surely, 2^21011121074 is an apocalyptic number.

21011121074 is a deficient number, since it is larger than the sum of its proper divisors (10975958974).

21011121074 is a wasteful number, since it uses less digits than its factorization.

21011121074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156799480.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21011121074 its reverse (47012111012), we get a palindrome (68023232086).

The spelling of 21011121074 in words is "twenty-one billion, eleven million, one hundred twenty-one thousand, seventy-four".