21413421221 has 8 divisors (see below), whose sum is σ = 22683956544. Its totient is φ = 20144099520.

The previous prime is 21413421209. The next prime is 21413421233. The reversal of 21413421221 is 12212431412.

It is an interprime number because it is at equal distance from previous prime (21413421209) and next prime (21413421233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21413421221 - 2³⁰ = 20339679397 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 (21413421251) 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, 266945 + ... + 337766.

It is an arithmetic number, because the mean of its divisors is an integer number (2835494568).

Almost surely, 2^21413421221 is an apocalyptic number.

It is an amenable number.

21413421221 is a deficient number, since it is larger than the sum of its proper divisors (1270535323).

21413421221 is a wasteful number, since it uses less digits than its factorization.

21413421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606811.

The product of its digits is 768, while the sum is 23.

Adding to 21413421221 its reverse (12212431412), we get a palindrome (33625852633).

The spelling of 21413421221 in words is "twenty-one billion, four hundred thirteen million, four hundred twenty-one thousand, two hundred twenty-one".