21121513351352 has 16 divisors (see below), whose sum is σ = 39610865752440. Its totient is φ = 10558615817376.

The previous prime is 21121513351349. The next prime is 21121513351381. The reversal of 21121513351352 is 25315331512112.

It is a super-2 number, since 2×21121513351352² (a number of 27 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 267565358 + ... + 267644285.

Almost surely, 2^{21121513351352} is an apocalyptic number.

It is an amenable number.

21121513351352 is a deficient number, since it is larger than the sum of its proper divisors (18489352401088).

21121513351352 is a wasteful number, since it uses less digits than its factorization.

21121513351352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535214582 (or 535214578 counting only the distinct ones).

The product of its digits is 27000, while the sum is 35.

Adding to 21121513351352 its reverse (25315331512112), we get a palindrome (46436844863464).

The spelling of 21121513351352 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred thirteen million, three hundred fifty-one thousand, three hundred fifty-two".