21231401343 has 4 divisors (see below), whose sum is σ = 28308535128. Its totient is φ = 14154267560.

The previous prime is 21231401333. The next prime is 21231401377. The reversal of 21231401343 is 34310413212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21231401343 - 2⁵ = 21231401311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231401333) 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, 3538566888 + ... + 3538566893.

It is an arithmetic number, because the mean of its divisors is an integer number (7077133782).

Almost surely, 2^21231401343 is an apocalyptic number.

21231401343 is a deficient number, since it is larger than the sum of its proper divisors (7077133785).

21231401343 is an equidigital number, since it uses as much as digits as its factorization.

21231401343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7077133784.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21231401343 its reverse (34310413212), we get a palindrome (55541814555).

The spelling of 21231401343 in words is "twenty-one billion, two hundred thirty-one million, four hundred one thousand, three hundred forty-three".