21151552154116 has 6 divisors (see below), whose sum is σ = 37015216269710. Its totient is φ = 10575776077056.

The previous prime is 21151552154059. The next prime is 21151552154129. The reversal of 21151552154116 is 61145125515112.

It can be written as a sum of positive squares in only one way, i.e., 20378489176516 + 773062977600 = 4514254^2 + 879240^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2643944019261 + ... + 2643944019268.

Almost surely, 2^{21151552154116} is an apocalyptic number.

It is an amenable number.

21151552154116 is a deficient number, since it is larger than the sum of its proper divisors (15863664115594).

21151552154116 is a wasteful number, since it uses less digits than its factorization.

21151552154116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287888038533 (or 5287888038531 counting only the distinct ones).

The product of its digits is 60000, while the sum is 40.

Adding to 21151552154116 its reverse (61145125515112), we get a palindrome (82296677669228).

The spelling of 21151552154116 in words is "twenty-one trillion, one hundred fifty-one billion, five hundred fifty-two million, one hundred fifty-four thousand, one hundred sixteen".