20121122211878 has 16 divisors (see below), whose sum is σ = 30374325764640. Its totient is φ = 9996543632256.

The previous prime is 20121122211877. The next prime is 20121122212021. The reversal of 20121122211878 is 87811222112102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121122211877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48963875 + ... + 49373102.

It is an arithmetic number, because the mean of its divisors is an integer number (1898395360290).

Almost surely, 2^{20121122211878} is an apocalyptic number.

20121122211878 is a deficient number, since it is larger than the sum of its proper divisors (10253203552762).

20121122211878 is a wasteful number, since it uses less digits than its factorization.

20121122211878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98337631.

The product of its (nonzero) digits is 14336, while the sum is 38.

The spelling of 20121122211878 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, eight hundred seventy-eight".