21001022430 has 32 divisors (see below), whose sum is σ = 53055216000. Its totient is φ = 5305521312.

The previous prime is 21001022407. The next prime is 21001022431. The reversal of 21001022430 is 3422010012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001022431) 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 15 ways as a sum of consecutive naturals, for example, 18421380 + ... + 18422519.

It is an arithmetic number, because the mean of its divisors is an integer number (1657975500).

Almost surely, 2^21001022430 is an apocalyptic number.

21001022430 is an abundant number, since it is smaller than the sum of its proper divisors (32054193570).

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

21001022430 is a wasteful number, since it uses less digits than its factorization.

21001022430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36843928.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21001022430 its reverse (3422010012), we get a palindrome (24423032442).

The spelling of 21001022430 in words is "twenty-one billion, one million, twenty-two thousand, four hundred thirty".