21301444212 has 24 divisors (see below), whose sum is σ = 49705740000. Its totient is φ = 7100142816.

The previous prime is 21301444127. The next prime is 21301444291. The reversal of 21301444212 is 21244410312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436414 + ... + 482762.

It is an arithmetic number, because the mean of its divisors is an integer number (2071072500).

Almost surely, 2^21301444212 is an apocalyptic number.

It is an amenable number.

21301444212 is an abundant number, since it is smaller than the sum of its proper divisors (28404295788).

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

21301444212 is a wasteful number, since it uses less digits than its factorization.

21301444212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84655 (or 84653 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21301444212 its reverse (21244410312), we get a palindrome (42545854524).

The spelling of 21301444212 in words is "twenty-one billion, three hundred one million, four hundred forty-four thousand, two hundred twelve".