212123456789898 has 16 divisors (see below), whose sum is σ = 424305746964576. Its totient is φ = 70698013365840.

The previous prime is 212123456789897. The next prime is 212123456789921. The reversal of 212123456789898 is 898987654321212.

212123456789898 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

212123456789898 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (212123456789891) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2451344161 + ... + 2451430692.

It is an arithmetic number, because the mean of its divisors is an integer number (26519109185286).

Almost surely, 2^{212123456789898} is an apocalyptic number.

212123456789898 is an abundant number, since it is smaller than the sum of its proper divisors (212182290174678).

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

212123456789898 is a wasteful number, since it uses less digits than its factorization.

212123456789898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4902782069.

The product of its digits is 836075520, while the sum is 75.

The spelling of 212123456789898 in words is "two hundred twelve trillion, one hundred twenty-three billion, four hundred fifty-six million, seven hundred eighty-nine thousand, eight hundred ninety-eight".