21153002012421 has 8 divisors (see below), whose sum is σ = 28205154012000. Its totient is φ = 14101425677232.

The previous prime is 21153002012381. The next prime is 21153002012423. The reversal of 21153002012421 is 12421020035112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21153002012421 - 2⁹ = 21153002011909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21153002012391 and 21153002012400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153002012423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143830350 + ... + 143977343.

It is an arithmetic number, because the mean of its divisors is an integer number (3525644251500).

Almost surely, 2^{21153002012421} is an apocalyptic number.

It is an amenable number.

21153002012421 is a deficient number, since it is larger than the sum of its proper divisors (7052151999579).

21153002012421 is a wasteful number, since it uses less digits than its factorization.

21153002012421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287832195.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21153002012421 its reverse (12421020035112), we get a palindrome (33574022047533).

The spelling of 21153002012421 in words is "twenty-one trillion, one hundred fifty-three billion, two million, twelve thousand, four hundred twenty-one".