211021031220 has 96 divisors (see below), whose sum is σ = 605401243776. Its totient is φ = 54887884800.

The previous prime is 211021031203. The next prime is 211021031251. The reversal of 211021031220 is 22130120112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 211021031220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20956627 + ... + 20966693.

It is an arithmetic number, because the mean of its divisors is an integer number (6306262956).

Almost surely, 2^211021031220 is an apocalyptic number.

211021031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211021031220 is an abundant number, since it is smaller than the sum of its proper divisors (394380212556).

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

211021031220 is a wasteful number, since it uses less digits than its factorization.

211021031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18641 (or 18639 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 211021031220 its reverse (22130120112), we get a palindrome (233151151332).

The spelling of 211021031220 in words is "two hundred eleven billion, twenty-one million, thirty-one thousand, two hundred twenty".