21142331011 has 4 divisors (see below), whose sum is σ = 21284226000. Its totient is φ = 21000436024.

The previous prime is 21142331003. The next prime is 21142331047. The reversal of 21142331011 is 11013324112.

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

It is a cyclic number.

It is not a de Polignac number, because 21142331011 - 2³ = 21142331003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21142331011.

It is not an unprimeable number, because it can be changed into a prime (21142331311) 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, 70947271 + ... + 70947568.

It is an arithmetic number, because the mean of its divisors is an integer number (5321056500).

Almost surely, 2^21142331011 is an apocalyptic number.

21142331011 is a deficient number, since it is larger than the sum of its proper divisors (141894989).

21142331011 is a wasteful number, since it uses less digits than its factorization.

21142331011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141894988.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21142331011 its reverse (11013324112), we get a palindrome (32155655123).

The spelling of 21142331011 in words is "twenty-one billion, one hundred forty-two million, three hundred thirty-one thousand, eleven".