21021440414 has 32 divisors (see below), whose sum is σ = 34507208736. Its totient is φ = 9545564160.

The previous prime is 21021440413. The next prime is 21021440417. The reversal of 21021440414 is 41404412012.

It is a self number, because there is not a number n which added to its sum of digits gives 21021440414.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021440413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1485854 + ... + 1499934.

It is an arithmetic number, because the mean of its divisors is an integer number (1078350273).

Almost surely, 2^21021440414 is an apocalyptic number.

21021440414 is a deficient number, since it is larger than the sum of its proper divisors (13485768322).

21021440414 is a wasteful number, since it uses less digits than its factorization.

21021440414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15020.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21021440414 its reverse (41404412012), we get a palindrome (62425852426).

The spelling of 21021440414 in words is "twenty-one billion, twenty-one million, four hundred forty thousand, four hundred fourteen".