21254125401 has 24 divisors (see below), whose sum is σ = 32325296640. Its totient is φ = 13419885600.

The previous prime is 21254125369. The next prime is 21254125421. The reversal of 21254125401 is 10452145212.

It is a happy number.

21254125401 is a `hidden beast` number, since 2 + 1 + 254 + 1 + 2 + 5 + 401 = 666.

It is not a de Polignac number, because 21254125401 - 2⁵ = 21254125369 is a prime.

It is a super-2 number, since 2×21254125401² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21254125421) 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 23 ways as a sum of consecutive naturals, for example, 672136 + ... + 703046.

It is an arithmetic number, because the mean of its divisors is an integer number (1346887360).

Almost surely, 2^21254125401 is an apocalyptic number.

It is an amenable number.

21254125401 is a deficient number, since it is larger than the sum of its proper divisors (11071171239).

21254125401 is a wasteful number, since it uses less digits than its factorization.

21254125401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34957 (or 34954 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The spelling of 21254125401 in words is "twenty-one billion, two hundred fifty-four million, one hundred twenty-five thousand, four hundred one".