20125070421 has 4 divisors (see below), whose sum is σ = 26833427232. Its totient is φ = 13416713612.

The previous prime is 20125070369. The next prime is 20125070437. The reversal of 20125070421 is 12407052102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20125070421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20125070391 and 20125070400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125077421) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 3354178401 + ... + 3354178406.

It is an arithmetic number, because the mean of its divisors is an integer number (6708356808).

Almost surely, 2^20125070421 is an apocalyptic number.

It is an amenable number.

20125070421 is a deficient number, since it is larger than the sum of its proper divisors (6708356811).

20125070421 is an equidigital number, since it uses as much as digits as its factorization.

20125070421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6708356810.

The product of its (nonzero) digits is 1120, while the sum is 24.

The spelling of 20125070421 in words is "twenty billion, one hundred twenty-five million, seventy thousand, four hundred twenty-one".