23151213520 has 40 divisors (see below), whose sum is σ = 54219491784. Its totient is φ = 9192886272.

The previous prime is 23151213473. The next prime is 23151213541. The reversal of 23151213520 is 2531215132.

It can be written as a sum of positive squares in 4 ways, for example, as 7762314816 + 15388898704 = 88104^2 + 124052^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1045209 + ... + 1067128.

Almost surely, 2^23151213520 is an apocalyptic number.

23151213520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23151213520 is an abundant number, since it is smaller than the sum of its proper divisors (31068278264).

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

23151213520 is a wasteful number, since it uses less digits than its factorization.

23151213520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112487 (or 2112481 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 23151213520 its reverse (2531215132), we get a palindrome (25682428652).

The spelling of 23151213520 in words is "twenty-three billion, one hundred fifty-one million, two hundred thirteen thousand, five hundred twenty".