20421012402 has 96 divisors (see below), whose sum is σ = 51365059200. Its totient is φ = 5742938880.

The previous prime is 20421012401. The next prime is 20421012433.

20421012402 is a `hidden beast` number, since 2 + 0 + 421 + 0 + 1 + 240 + 2 = 666.

20421012402 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20421012401) 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 47 ways as a sum of consecutive naturals, for example, 2935224 + ... + 2942172.

It is an arithmetic number, because the mean of its divisors is an integer number (535052700).

Almost surely, 2^20421012402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20421012402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25682529600).

20421012402 is an abundant number, since it is smaller than the sum of its proper divisors (30944046798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20421012402 is a wasteful number, since it uses less digits than its factorization.

20421012402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7328 (or 7325 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

It can be divided in two parts, 204210 and 12402, that added together give a palindrome (216612).

The spelling of 20421012402 in words is "twenty billion, four hundred twenty-one million, twelve thousand, four hundred two".