21123121132 has 24 divisors (see below), whose sum is σ = 37113359696. Its totient is φ = 10519339968.

The previous prime is 21123121121. The next prime is 21123121141. The reversal of 21123121132 is 23112132112.

It is a super-2 number, since 2×21123121132² (a number of 21 digits) contains 22 as substring.

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, 4386358 + ... + 4391170.

Almost surely, 2^21123121132 is an apocalyptic number.

It is an amenable number.

21123121132 is a deficient number, since it is larger than the sum of its proper divisors (15990238564).

21123121132 is a wasteful number, since it uses less digits than its factorization.

21123121132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8977 (or 8975 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 21123121132 its reverse (23112132112), we get a palindrome (44235253244).

The spelling of 21123121132 in words is "twenty-one billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred thirty-two".