21265073142 has 16 divisors (see below), whose sum is σ = 42559076352. Its totient is φ = 7083536040.

The previous prime is 21265073129. The next prime is 21265073143. The reversal of 21265073142 is 24137056212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21265073143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1195858 + ... + 1213509.

It is an arithmetic number, because the mean of its divisors is an integer number (2659942272).

Almost surely, 2^21265073142 is an apocalyptic number.

21265073142 is an abundant number, since it is smaller than the sum of its proper divisors (21294003210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21265073142 is a wasteful number, since it uses less digits than its factorization.

21265073142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410843.

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 21265073142 in words is "twenty-one billion, two hundred sixty-five million, seventy-three thousand, one hundred forty-two".