21121153250313 has 16 divisors (see below), whose sum is σ = 28232326124352. Its totient is φ = 14045376000000.

The previous prime is 21121153250237. The next prime is 21121153250317. The reversal of 21121153250313 is 31305235112112.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21121153250313 is a prime.

It is a super-2 number, since 2×21121153250313² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21121153250317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73384938 + ... + 73672188.

It is an arithmetic number, because the mean of its divisors is an integer number (1764520382772).

Almost surely, 2^{21121153250313} is an apocalyptic number.

It is an amenable number.

21121153250313 is a deficient number, since it is larger than the sum of its proper divisors (7111172874039).

21121153250313 is a wasteful number, since it uses less digits than its factorization.

21121153250313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348776.

The product of its (nonzero) digits is 5400, while the sum is 30.

Adding to 21121153250313 its reverse (31305235112112), we get a palindrome (52426388362425).

The spelling of 21121153250313 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred fifty-three million, two hundred fifty thousand, three hundred thirteen".