21000245343 has 32 divisors (see below), whose sum is σ = 35123730432. Its totient is φ = 10842271200.

The previous prime is 21000245341. The next prime is 21000245351. The reversal of 21000245343 is 34354200012.

It is not a de Polignac number, because 21000245343 - 2¹ = 21000245341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000245341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241213 + ... + 316518.

It is an arithmetic number, because the mean of its divisors is an integer number (1097616576).

Almost surely, 2^21000245343 is an apocalyptic number.

21000245343 is a deficient number, since it is larger than the sum of its proper divisors (14123485089).

21000245343 is a wasteful number, since it uses less digits than its factorization.

21000245343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557915.

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 21000245343 its reverse (34354200012), we get a palindrome (55354445355).

The spelling of 21000245343 in words is "twenty-one billion, two hundred forty-five thousand, three hundred forty-three".