21014333421 has 16 divisors (see below), whose sum is σ = 28736864640. Its totient is φ = 13654180800.

The previous prime is 21014333411. The next prime is 21014333441. The reversal of 21014333421 is 12433341012.

It is a happy number.

It is not a de Polignac number, because 21014333421 - 2²⁵ = 20980778989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21014333391 and 21014333400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014333411) 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, 413626 + ... + 461643.

It is an arithmetic number, because the mean of its divisors is an integer number (1796054040).

Almost surely, 2^21014333421 is an apocalyptic number.

It is an amenable number.

21014333421 is a deficient number, since it is larger than the sum of its proper divisors (7722531219).

21014333421 is a wasteful number, since it uses less digits than its factorization.

21014333421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875476.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21014333421 its reverse (12433341012), we get a palindrome (33447674433).

The spelling of 21014333421 in words is "twenty-one billion, fourteen million, three hundred thirty-three thousand, four hundred twenty-one".