21251054125435 has 8 divisors (see below), whose sum is σ = 25860437696736. Its totient is φ = 16761394802880.

The previous prime is 21251054125393. The next prime is 21251054125459. The reversal of 21251054125435 is 53452145015212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21251054125435 is a prime.

It is a Duffinian 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, 29931061794 + ... + 29931062503.

It is an arithmetic number, because the mean of its divisors is an integer number (3232554712092).

Almost surely, 2^{21251054125435} is an apocalyptic number.

21251054125435 is a deficient number, since it is larger than the sum of its proper divisors (4609383571301).

21251054125435 is an equidigital number, since it uses as much as digits as its factorization.

21251054125435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59862124373.

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 21251054125435 in words is "twenty-one trillion, two hundred fifty-one billion, fifty-four million, one hundred twenty-five thousand, four hundred thirty-five".