21121311253006 has 8 divisors (see below), whose sum is σ = 31972627126440. Its totient is φ = 10463768877528.

The previous prime is 21121311253001. The next prime is 21121311253037. The reversal of 21121311253006 is 60035211312112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21121311253006² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121311253001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48443374216 + ... + 48443374651.

It is an arithmetic number, because the mean of its divisors is an integer number (3996578390805).

Almost surely, 2^{21121311253006} is an apocalyptic number.

21121311253006 is a deficient number, since it is larger than the sum of its proper divisors (10851315873434).

21121311253006 is a wasteful number, since it uses less digits than its factorization.

21121311253006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96886748978.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 21121311253006 its reverse (60035211312112), we get a palindrome (81156522565118).

The spelling of 21121311253006 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred eleven million, two hundred fifty-three thousand, six".