20255257421 has 8 divisors (see below), whose sum is σ = 23232437760. Its totient is φ = 17298970128.

The previous prime is 20255257411. The next prime is 20255257423. The reversal of 20255257421 is 12475255202.

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

It is a cyclic number.

It is not a de Polignac number, because 20255257421 - 2²⁶ = 20188148557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20255257423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5221181 + ... + 5225058.

It is an arithmetic number, because the mean of its divisors is an integer number (2904054720).

Almost surely, 2^20255257421 is an apocalyptic number.

It is an amenable number.

20255257421 is a deficient number, since it is larger than the sum of its proper divisors (2977180339).

20255257421 is a wasteful number, since it uses less digits than its factorization.

20255257421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10446523.

The product of its (nonzero) digits is 56000, while the sum is 35.

The spelling of 20255257421 in words is "twenty billion, two hundred fifty-five million, two hundred fifty-seven thousand, four hundred twenty-one".