21345211512 has 24 divisors (see below), whose sum is σ = 57809948040. Its totient is φ = 7115070480.

The previous prime is 21345211507. The next prime is 21345211523. The reversal of 21345211512 is 21511254312.

It is a happy number.

21345211512 is a `hidden beast` number, since 2 + 134 + 5 + 2 + 11 + 512 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21345211512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148230564 + ... + 148230707.

It is an arithmetic number, because the mean of its divisors is an integer number (2408747835).

Almost surely, 2^21345211512 is an apocalyptic number.

It is an amenable number.

21345211512 is an abundant number, since it is smaller than the sum of its proper divisors (36464736528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21345211512 is a wasteful number, since it uses less digits than its factorization.

21345211512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296461283 (or 296461276 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

Adding to 21345211512 its reverse (21511254312), we get a palindrome (42856465824).

The spelling of 21345211512 in words is "twenty-one billion, three hundred forty-five million, two hundred eleven thousand, five hundred twelve".