21221434302 has 8 divisors (see below), whose sum is σ = 42442868616. Its totient is φ = 7073811432.

The previous prime is 21221434301. The next prime is 21221434337. The reversal of 21221434302 is 20343412212.

It is a happy number.

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

21221434302 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221434301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768452853 + ... + 1768452864.

It is an arithmetic number, because the mean of its divisors is an integer number (5305358577).

Almost surely, 2^21221434302 is an apocalyptic number.

21221434302 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221434302 is a wasteful number, since it uses less digits than its factorization.

21221434302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536905722.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21221434302 its reverse (20343412212), we get a palindrome (41564846514).

The spelling of 21221434302 in words is "twenty-one billion, two hundred twenty-one million, four hundred thirty-four thousand, three hundred two".