21312204441 has 12 divisors (see below), whose sum is σ = 31234415856. Its totient is φ = 12916487320.

The previous prime is 21312204413. The next prime is 21312204443. The reversal of 21312204441 is 14440221312.

It is not a de Polignac number, because 21312204441 - 2¹⁹ = 21311680153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21312204443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29355291 + ... + 29356016.

It is an arithmetic number, because the mean of its divisors is an integer number (2602867988).

Almost surely, 2^21312204441 is an apocalyptic number.

It is an amenable number.

21312204441 is a deficient number, since it is larger than the sum of its proper divisors (9922211415).

21312204441 is a wasteful number, since it uses less digits than its factorization.

21312204441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58711332 (or 58711321 counting only the distinct ones).

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

Adding to 21312204441 its reverse (14440221312), we get a palindrome (35752425753).

The spelling of 21312204441 in words is "twenty-one billion, three hundred twelve million, two hundred four thousand, four hundred forty-one".