21125143073401 has 4 divisors (see below), whose sum is σ = 21136071757732. Its totient is φ = 21114214389072.

The previous prime is 21125143073393. The next prime is 21125143073407. The reversal of 21125143073401 is 10437034152112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17452174656400 + 3672968417001 = 4177580^2 + 1916499^2 .

It is a cyclic number.

It is not a de Polignac number, because 21125143073401 - 2³ = 21125143073393 is a prime.

It is a super-3 number, since 3×21125143073401³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21125143073407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5464339266 + ... + 5464343131.

It is an arithmetic number, because the mean of its divisors is an integer number (5284017939433).

Almost surely, 2^{21125143073401} is an apocalyptic number.

It is an amenable number.

21125143073401 is a deficient number, since it is larger than the sum of its proper divisors (10928684331).

21125143073401 is a wasteful number, since it uses less digits than its factorization.

21125143073401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10928684330.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 21125143073401 in words is "twenty-one trillion, one hundred twenty-five billion, one hundred forty-three million, seventy-three thousand, four hundred one".