21121570514 has 24 divisors (see below), whose sum is σ = 36657279120. Its totient is φ = 9095411160.

The previous prime is 21121570511. The next prime is 21121570517. The reversal of 21121570514 is 41507512112.

It is an interprime number because it is at equal distance from previous prime (21121570511) and next prime (21121570517).

It is a super-2 number, since 2×21121570514² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121570511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2292224 + ... + 2301419.

It is an arithmetic number, because the mean of its divisors is an integer number (1527386630).

Almost surely, 2^21121570514 is an apocalyptic number.

21121570514 is a deficient number, since it is larger than the sum of its proper divisors (15535708606).

21121570514 is a wasteful number, since it uses less digits than its factorization.

21121570514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4593686 (or 4593675 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The spelling of 21121570514 in words is "twenty-one billion, one hundred twenty-one million, five hundred seventy thousand, five hundred fourteen".