21121200120070 has 16 divisors (see below), whose sum is σ = 38059529286240. Its totient is φ = 8439286921344.

The previous prime is 21121200120047. The next prime is 21121200120071. The reversal of 21121200120070 is 7002100212112.

It is a super-2 number, since 2×21121200120070² (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 (21121200120071) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1149131187 + ... + 1149149566.

It is an arithmetic number, because the mean of its divisors is an integer number (2378720580390).

Almost surely, 2^{21121200120070} is an apocalyptic number.

21121200120070 is a deficient number, since it is larger than the sum of its proper divisors (16938329166170).

21121200120070 is a wasteful number, since it uses less digits than its factorization.

21121200120070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298281679.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 21121200120070 its reverse (7002100212112), we get a palindrome (28123300332182).

The spelling of 21121200120070 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred million, one hundred twenty thousand, seventy".