21142443011 has 32 divisors (see below), whose sum is σ = 22873743360. Its totient is φ = 19504606464.

The previous prime is 21142442999. The next prime is 21142443013. The reversal of 21142443011 is 11034424112.

It is a cyclic number.

It is not a de Polignac number, because 21142443011 - 2²² = 21138248707 is a prime.

It is a super-2 number, since 2×21142443011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21142443013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10247366 + ... + 10249428.

It is an arithmetic number, because the mean of its divisors is an integer number (714804480).

Almost surely, 2^21142443011 is an apocalyptic number.

21142443011 is a deficient number, since it is larger than the sum of its proper divisors (1731300349).

21142443011 is a wasteful number, since it uses less digits than its factorization.

21142443011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21142443011 its reverse (11034424112), we get a palindrome (32176867123).

The spelling of 21142443011 in words is "twenty-one billion, one hundred forty-two million, four hundred forty-three thousand, eleven".