20401421535 has 64 divisors (see below), whose sum is σ = 39717596160. Its totient is φ = 9853799040.

The previous prime is 20401421519. The next prime is 20401421539. The reversal of 20401421535 is 53512410402.

20401421535 is a `hidden beast` number, since 204 + 0 + 1 + 421 + 5 + 35 = 666.

It is not a de Polignac number, because 20401421535 - 2⁴ = 20401421519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20401421499 and 20401421508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401421539) 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 63 ways as a sum of consecutive naturals, for example, 364437 + ... + 416673.

It is an arithmetic number, because the mean of its divisors is an integer number (620587440).

Almost surely, 2^20401421535 is an apocalyptic number.

20401421535 is a deficient number, since it is larger than the sum of its proper divisors (19316174625).

20401421535 is a wasteful number, since it uses less digits than its factorization.

20401421535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52525 (or 52519 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 20401421535 its reverse (53512410402), we get a palindrome (73913831937).

The spelling of 20401421535 in words is "twenty billion, four hundred one million, four hundred twenty-one thousand, five hundred thirty-five".