21320123421430 has 16 divisors (see below), whose sum is σ = 38514764481840. Its totient is φ = 8497262185632.

The previous prime is 21320123421413. The next prime is 21320123421433. The reversal of 21320123421430 is 3412432102312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320123421433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3848394960 + ... + 3848400499.

It is an arithmetic number, because the mean of its divisors is an integer number (2407172780115).

Almost surely, 2^{21320123421430} is an apocalyptic number.

21320123421430 is a deficient number, since it is larger than the sum of its proper divisors (17194641060410).

21320123421430 is a wasteful number, since it uses less digits than its factorization.

21320123421430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7696795743.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21320123421430 its reverse (3412432102312), we get a palindrome (24732555523742).

The spelling of 21320123421430 in words is "twenty-one trillion, three hundred twenty billion, one hundred twenty-three million, four hundred twenty-one thousand, four hundred thirty".