21121311206132 has 6 divisors (see below), whose sum is σ = 36962294610738. Its totient is φ = 10560655603064.

The previous prime is 21121311206129. The next prime is 21121311206141. The reversal of 21121311206132 is 23160211312112.

It can be written as a sum of positive squares in only one way, i.e., 14896465844836 + 6224845361296 = 3859594^2 + 2494964^2 .

It is a super-2 number, since 2×21121311206132² (a number of 27 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, 2640163900763 + ... + 2640163900770.

It is an arithmetic number, because the mean of its divisors is an integer number (6160382435123).

Almost surely, 2^{21121311206132} is an apocalyptic number.

It is an amenable number.

21121311206132 is a deficient number, since it is larger than the sum of its proper divisors (15840983404606).

21121311206132 is a wasteful number, since it uses less digits than its factorization.

21121311206132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280327801537 (or 5280327801535 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 21121311206132 its reverse (23160211312112), we get a palindrome (44281522518244).

The spelling of 21121311206132 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred eleven million, two hundred six thousand, one hundred thirty-two".