21153115153510 has 32 divisors (see below), whose sum is σ = 38170538102592. Its totient is φ = 8440165578240.

The previous prime is 21153115153501. The next prime is 21153115153543. The reversal of 21153115153510 is 1535151135112.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10156354 + ... + 12060586.

It is an arithmetic number, because the mean of its divisors is an integer number (1192829315706).

Almost surely, 2^{21153115153510} is an apocalyptic number.

21153115153510 is a deficient number, since it is larger than the sum of its proper divisors (17017422949082).

21153115153510 is a wasteful number, since it uses less digits than its factorization.

21153115153510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907008.

The product of its (nonzero) digits is 11250, while the sum is 34.

Adding to 21153115153510 its reverse (1535151135112), we get a palindrome (22688266288622).

The spelling of 21153115153510 in words is "twenty-one trillion, one hundred fifty-three billion, one hundred fifteen million, one hundred fifty-three thousand, five hundred ten".