21251123110046 has 32 divisors (see below), whose sum is σ = 32555977822368. Its totient is φ = 10400103001600.

The previous prime is 21251123110001. The next prime is 21251123110057. The reversal of 21251123110046 is 64001132115212.

It is a happy number.

It is a super-2 number, since 2×21251123110046² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201568946 + ... + 201674346.

It is an arithmetic number, because the mean of its divisors is an integer number (1017374306949).

Almost surely, 2^{21251123110046} is an apocalyptic number.

21251123110046 is a deficient number, since it is larger than the sum of its proper divisors (11304854712322).

21251123110046 is a wasteful number, since it uses less digits than its factorization.

21251123110046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109996.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 21251123110046 its reverse (64001132115212), we get a palindrome (85252255225258).

The spelling of 21251123110046 in words is "twenty-one trillion, two hundred fifty-one billion, one hundred twenty-three million, one hundred ten thousand, forty-six".