21312212043 has 8 divisors (see below), whose sum is σ = 28507654656. Its totient is φ = 14162455400.

The previous prime is 21312211951. The next prime is 21312212093. The reversal of 21312212043 is 34021221312.

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 21312212043 - 2¹⁴ = 21312195659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21312212093) 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, 11420403 + ... + 11422268.

It is an arithmetic number, because the mean of its divisors is an integer number (3563456832).

Almost surely, 2^21312212043 is an apocalyptic number.

21312212043 is a deficient number, since it is larger than the sum of its proper divisors (7195442613).

21312212043 is a wasteful number, since it uses less digits than its factorization.

21312212043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22842985.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21312212043 its reverse (34021221312), we get a palindrome (55333433355).

The spelling of 21312212043 in words is "twenty-one billion, three hundred twelve million, two hundred twelve thousand, forty-three".