211211021020 has 24 divisors (see below), whose sum is σ = 443713258800. Its totient is φ = 84452005632.

The previous prime is 211211020991. The next prime is 211211021027. The reversal of 211211021020 is 20120112112.

It is a super-2 number, since 2×211211021020² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211021027) 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, 1971690 + ... + 2076049.

It is an arithmetic number, because the mean of its divisors is an integer number (18488052450).

Almost surely, 2^211211021020 is an apocalyptic number.

211211021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211211021020 is an abundant number, since it is smaller than the sum of its proper divisors (232502237780).

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

211211021020 is a wasteful number, since it uses less digits than its factorization.

211211021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050357 (or 4050355 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211211021020 its reverse (20120112112), we get a palindrome (231331133132).

The spelling of 211211021020 in words is "two hundred eleven billion, two hundred eleven million, twenty-one thousand, twenty".