21414454621 has 16 divisors (see below), whose sum is σ = 25775775360. Its totient is φ = 17379714240.

The previous prime is 21414454619. The next prime is 21414454637. The reversal of 21414454621 is 12645441412.

It is not a de Polignac number, because 21414454621 - 2¹ = 21414454619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414454661) 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, 206751 + ... + 292531.

It is an arithmetic number, because the mean of its divisors is an integer number (1610985960).

Almost surely, 2^21414454621 is an apocalyptic number.

It is an amenable number.

21414454621 is a deficient number, since it is larger than the sum of its proper divisors (4361320739).

21414454621 is a wasteful number, since it uses less digits than its factorization.

21414454621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87684.

The product of its digits is 30720, while the sum is 34.

The spelling of 21414454621 in words is "twenty-one billion, four hundred fourteen million, four hundred fifty-four thousand, six hundred twenty-one".