20435015421 has 40 divisors (see below), whose sum is σ = 30676973184. Its totient is φ = 13556350080.

The previous prime is 20435015411. The next prime is 20435015441. The reversal of 20435015421 is 12451053402.

20435015421 is a `hidden beast` number, since 204 + 35 + 0 + 1 + 5 + 421 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-20435015421 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20435015411) 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 39 ways as a sum of consecutive naturals, for example, 22430956 + ... + 22431866.

Almost surely, 2^20435015421 is an apocalyptic number.

It is an amenable number.

20435015421 is a deficient number, since it is larger than the sum of its proper divisors (10241957763).

20435015421 is an equidigital number, since it uses as much as digits as its factorization.

20435015421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983 (or 1974 counting only the distinct ones).

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

Adding to 20435015421 its reverse (12451053402), we get a palindrome (32886068823).

The spelling of 20435015421 in words is "twenty billion, four hundred thirty-five million, fifteen thousand, four hundred twenty-one".