211001012020 has 24 divisors (see below), whose sum is σ = 443114174664. Its totient is φ = 84398109696.

The previous prime is 211001011993. The next prime is 211001012021. The reversal of 211001012020 is 20210100112.

It can be written as a sum of positive squares in 4 ways, for example, as 58847967396 + 152153044624 = 242586^2 + 390068^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 211001011988 and 211001012006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211001012021) 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, 744472 + ... + 988048.

It is an arithmetic number, because the mean of its divisors is an integer number (18463090611).

Almost surely, 2^211001012020 is an apocalyptic number.

211001012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211001012020 is an abundant number, since it is smaller than the sum of its proper divisors (232113162644).

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

211001012020 is a wasteful number, since it uses less digits than its factorization.

211001012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286899 (or 286897 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 211001012020 its reverse (20210100112), we get a palindrome (231211112132).

The spelling of 211001012020 in words is "two hundred eleven billion, one million, twelve thousand, twenty".