21153140403 has 4 divisors (see below), whose sum is σ = 28204187208. Its totient is φ = 14102093600.

The previous prime is 21153140353. The next prime is 21153140419. The reversal of 21153140403 is 30404135112.

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 21153140403 - 2⁸ = 21153140147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21153140453) 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, 3525523398 + ... + 3525523403.

It is an arithmetic number, because the mean of its divisors is an integer number (7051046802).

Almost surely, 2^21153140403 is an apocalyptic number.

21153140403 is a deficient number, since it is larger than the sum of its proper divisors (7051046805).

21153140403 is an equidigital number, since it uses as much as digits as its factorization.

21153140403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7051046804.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21153140403 its reverse (30404135112), we get a palindrome (51557275515).

The spelling of 21153140403 in words is "twenty-one billion, one hundred fifty-three million, one hundred forty thousand, four hundred three".