21140214421 has 16 divisors (see below), whose sum is σ = 21661657920. Its totient is φ = 20624595840.

The previous prime is 21140214413. The next prime is 21140214437. The reversal of 21140214421 is 12441204112.

It is a cyclic number.

It is not a de Polignac number, because 21140214421 - 2³ = 21140214413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21140214392 and 21140214401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140214481) 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, 9817881 + ... + 9820033.

It is an arithmetic number, because the mean of its divisors is an integer number (1353853620).

Almost surely, 2^21140214421 is an apocalyptic number.

It is an amenable number.

21140214421 is a deficient number, since it is larger than the sum of its proper divisors (521443499).

21140214421 is a wasteful number, since it uses less digits than its factorization.

21140214421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3396.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21140214421 its reverse (12441204112), we get a palindrome (33581418533).

The spelling of 21140214421 in words is "twenty-one billion, one hundred forty million, two hundred fourteen thousand, four hundred twenty-one".