20421177019 has 8 divisors (see below), whose sum is σ = 21623928480. Its totient is φ = 19218592896.

The previous prime is 20421177017. The next prime is 20421177037. The reversal of 20421177019 is 91077112402.

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 20421177019 - 2¹ = 20421177017 is a prime.

It is a super-2 number, since 2×20421177019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421177017) 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, 280402 + ... + 345640.

It is an arithmetic number, because the mean of its divisors is an integer number (2702991060).

Almost surely, 2^20421177019 is an apocalyptic number.

20421177019 is a deficient number, since it is larger than the sum of its proper divisors (1202751461).

20421177019 is a wasteful number, since it uses less digits than its factorization.

20421177019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83669.

The product of its (nonzero) digits is 7056, while the sum is 34.

The spelling of 20421177019 in words is "twenty billion, four hundred twenty-one million, one hundred seventy-seven thousand, nineteen".