20421413511 has 16 divisors (see below), whose sum is σ = 27393759360. Its totient is φ = 13531745120.

The previous prime is 20421413479. The next prime is 20421413533. The reversal of 20421413511 is 11531412402.

It is a cyclic number.

It is not a de Polignac number, because 20421413511 - 2⁵ = 20421413479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421413611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1286821 + ... + 1302593.

It is an arithmetic number, because the mean of its divisors is an integer number (1712109960).

Almost surely, 2^20421413511 is an apocalyptic number.

20421413511 is a deficient number, since it is larger than the sum of its proper divisors (6972345849).

20421413511 is a wasteful number, since it uses less digits than its factorization.

20421413511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18366.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 20421413511 its reverse (11531412402), we get a palindrome (31952825913).

The spelling of 20421413511 in words is "twenty billion, four hundred twenty-one million, four hundred thirteen thousand, five hundred eleven".