20001421332 has 144 divisors (see below), whose sum is σ = 54826087680. Its totient is φ = 6124179456.

The previous prime is 20001421331. The next prime is 20001421337. The reversal of 20001421332 is 23312410002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001421331) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13432044 + ... + 13433532.

It is an arithmetic number, because the mean of its divisors is an integer number (380736720).

Almost surely, 2^20001421332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20001421332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27413043840).

20001421332 is an abundant number, since it is smaller than the sum of its proper divisors (34824666348).

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

20001421332 is a wasteful number, since it uses less digits than its factorization.

20001421332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030 (or 2025 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20001421332 its reverse (23312410002), we get a palindrome (43313831334).

The spelling of 20001421332 in words is "twenty billion, one million, four hundred twenty-one thousand, three hundred thirty-two".