20851625122 has 4 divisors (see below), whose sum is σ = 31277437686. Its totient is φ = 10425812560.

The previous prime is 20851625101. The next prime is 20851625149. The reversal of 20851625122 is 22152615802.

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., 20535176601 + 316448521 = 143301^2 + 17789^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5212906279 + ... + 5212906282.

Almost surely, 2^20851625122 is an apocalyptic number.

20851625122 is a deficient number, since it is larger than the sum of its proper divisors (10425812564).

20851625122 is a wasteful number, since it uses less digits than its factorization.

20851625122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10425812563.

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 20851625122 in words is "twenty billion, eight hundred fifty-one million, six hundred twenty-five thousand, one hundred twenty-two".