20121210858 has 32 divisors (see below), whose sum is σ = 47474933760. Its totient is φ = 5563468080.

The previous prime is 20121210847. The next prime is 20121210859. The reversal of 20121210858 is 85801212102.

It is not an unprimeable number, because it can be changed into a prime (20121210859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7725738 + ... + 7728341.

It is an arithmetic number, because the mean of its divisors is an integer number (1483591680).

Almost surely, 2^20121210858 is an apocalyptic number.

20121210858 is an abundant number, since it is smaller than the sum of its proper divisors (27353722902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20121210858 is a wasteful number, since it uses less digits than its factorization.

20121210858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15454122.

The product of its (nonzero) digits is 2560, while the sum is 30.

The spelling of 20121210858 in words is "twenty billion, one hundred twenty-one million, two hundred ten thousand, eight hundred fifty-eight".