21125214254 has 16 divisors (see below), whose sum is σ = 33572750400. Its totient is φ = 9935073024.

The previous prime is 21125214241. The next prime is 21125214293. The reversal of 21125214254 is 45241252112.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138374 + ... + 247785.

It is an arithmetic number, because the mean of its divisors is an integer number (2098296900).

Almost surely, 2^21125214254 is an apocalyptic number.

21125214254 is a deficient number, since it is larger than the sum of its proper divisors (12447536146).

21125214254 is a wasteful number, since it uses less digits than its factorization.

21125214254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387787.

The product of its digits is 6400, while the sum is 29.

Adding to 21125214254 its reverse (45241252112), we get a palindrome (66366466366).

The spelling of 21125214254 in words is "twenty-one billion, one hundred twenty-five million, two hundred fourteen thousand, two hundred fifty-four".