20011515421 has 8 divisors (see below), whose sum is σ = 20116712000. Its totient is φ = 19906365600.

The previous prime is 20011515413. The next prime is 20011515427. The reversal of 20011515421 is 12451511002.

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 20011515421 - 2³ = 20011515413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011515392 and 20011515401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011515427) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1141321 + ... + 1158721.

It is an arithmetic number, because the mean of its divisors is an integer number (2514589000).

Almost surely, 2^20011515421 is an apocalyptic number.

It is an amenable number.

20011515421 is a deficient number, since it is larger than the sum of its proper divisors (105196579).

20011515421 is a wasteful number, since it uses less digits than its factorization.

20011515421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23379.

The product of its (nonzero) digits is 400, while the sum is 22.

The spelling of 20011515421 in words is "twenty billion, eleven million, five hundred fifteen thousand, four hundred twenty-one".