21442635123 has 32 divisors (see below), whose sum is σ = 36138955776. Its totient is φ = 11004709248.

The previous prime is 21442635121. The next prime is 21442635161. The reversal of 21442635123 is 32153624412.

It is not a de Polignac number, because 21442635123 - 2¹ = 21442635121 is a prime.

It is a super-2 number, since 2×21442635123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21442635121) 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 31 ways as a sum of consecutive naturals, for example, 1051311 + ... + 1071512.

It is an arithmetic number, because the mean of its divisors is an integer number (1129342368).

Almost surely, 2^21442635123 is an apocalyptic number.

21442635123 is a deficient number, since it is larger than the sum of its proper divisors (14696320653).

21442635123 is a wasteful number, since it uses less digits than its factorization.

21442635123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122883.

The product of its digits is 34560, while the sum is 33.

The spelling of 21442635123 in words is "twenty-one billion, four hundred forty-two million, six hundred thirty-five thousand, one hundred twenty-three".