21142423126 has 32 divisors (see below), whose sum is σ = 34735205376. Its totient is φ = 9571800000.

The previous prime is 21142423121. The next prime is 21142423129. The reversal of 21142423126 is 62132424112.

It is a super-2 number, since 2×21142423126² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21142423094 and 21142423103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142423121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7043626 + ... + 7046626.

It is an arithmetic number, because the mean of its divisors is an integer number (1085475168).

Almost surely, 2^21142423126 is an apocalyptic number.

21142423126 is a deficient number, since it is larger than the sum of its proper divisors (13592782250).

21142423126 is a wasteful number, since it uses less digits than its factorization.

21142423126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4188.

The product of its digits is 4608, while the sum is 28.

Adding to 21142423126 its reverse (62132424112), we get a palindrome (83274847238).

The spelling of 21142423126 in words is "twenty-one billion, one hundred forty-two million, four hundred twenty-three thousand, one hundred twenty-six".