21051246125002 has 4 divisors (see below), whose sum is σ = 31576869187506. Its totient is φ = 10525623062500.

The previous prime is 21051246124957. The next prime is 21051246125027. The reversal of 21051246125002 is 20052164215012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17677408211401 + 3373837913601 = 4204451^2 + 1836801^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5262811531249 + ... + 5262811531252.

Almost surely, 2^{21051246125002} is an apocalyptic number.

21051246125002 is a deficient number, since it is larger than the sum of its proper divisors (10525623062504).

21051246125002 is a wasteful number, since it uses less digits than its factorization.

21051246125002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10525623062503.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 21051246125002 in words is "twenty-one trillion, fifty-one billion, two hundred forty-six million, one hundred twenty-five thousand, two".