211001000020 has 24 divisors (see below), whose sum is σ = 444063295368. Its totient is φ = 84217315200.

The previous prime is 211000999997. The next prime is 211001000053. The reversal of 211001000020 is 20000100112.

It can be written as a sum of positive squares in 4 ways, for example, as 19811688516 + 191189311504 = 140754^2 + 437252^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211000999967 and 211001000012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11433351 + ... + 11451790.

It is an arithmetic number, because the mean of its divisors is an integer number (18502637307).

Almost surely, 2^211001000020 is an apocalyptic number.

211001000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211001000020 is an abundant number, since it is smaller than the sum of its proper divisors (233062295348).

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

211001000020 is a wasteful number, since it uses less digits than its factorization.

211001000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22885611 (or 22885609 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 211001000020 its reverse (20000100112), we get a palindrome (231001100132).

The spelling of 211001000020 in words is "two hundred eleven billion, one million, twenty", and thus it is an aban number.