21251052401342 has 32 divisors (see below), whose sum is σ = 32764605235200. Its totient is φ = 10334128974400.

The previous prime is 21251052401297. The next prime is 21251052401419. The reversal of 21251052401342 is 24310425015212.

It is a junction number, because it is equal to n+sod(n) for n = 21251052401299 and 21251052401308.

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, 3496259 + ... + 7397697.

It is an arithmetic number, because the mean of its divisors is an integer number (1023893913600).

Almost surely, 2^{21251052401342} is an apocalyptic number.

21251052401342 is a deficient number, since it is larger than the sum of its proper divisors (11513552833858).

21251052401342 is a wasteful number, since it uses less digits than its factorization.

21251052401342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902032.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21251052401342 its reverse (24310425015212), we get a palindrome (45561477416554).

The spelling of 21251052401342 in words is "twenty-one trillion, two hundred fifty-one billion, fifty-two million, four hundred one thousand, three hundred forty-two".