21030431512 has 8 divisors (see below), whose sum is σ = 39432059100. Its totient is φ = 10515215752.

The previous prime is 21030431491. The next prime is 21030431533. The reversal of 21030431512 is 21513403012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21030431491) and next prime (21030431533).

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21030431512² (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 as a sum of consecutive naturals, namely, 1314401962 + ... + 1314401977.

Almost surely, 2^21030431512 is an apocalyptic number.

It is an amenable number.

21030431512 is a deficient number, since it is larger than the sum of its proper divisors (18401627588).

21030431512 is a wasteful number, since it uses less digits than its factorization.

21030431512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628803945 (or 2628803941 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21030431512 its reverse (21513403012), we get a palindrome (42543834524).

The spelling of 21030431512 in words is "twenty-one billion, thirty million, four hundred thirty-one thousand, five hundred twelve".