21001125614654 has 32 divisors (see below), whose sum is σ = 31726868620800. Its totient is φ = 10425733873632.

The previous prime is 21001125614617. The next prime is 21001125614681. The reversal of 21001125614654 is 45641652110012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1901064959 + ... + 1901076005.

It is an arithmetic number, because the mean of its divisors is an integer number (991464644400).

Almost surely, 2^{21001125614654} is an apocalyptic number.

21001125614654 is a deficient number, since it is larger than the sum of its proper divisors (10725743006146).

21001125614654 is a wasteful number, since it uses less digits than its factorization.

21001125614654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20904.

The product of its (nonzero) digits is 57600, while the sum is 38.

Adding to 21001125614654 its reverse (45641652110012), we get a palindrome (66642777724666).

The spelling of 21001125614654 in words is "twenty-one trillion, one billion, one hundred twenty-five million, six hundred fourteen thousand, six hundred fifty-four".