211445031 has 32 divisors (see below), whose sum is σ = 342074880. Its totient is φ = 113412096.

The previous prime is 211445027. The next prime is 211445033. The reversal of 211445031 is 130544112.

211445031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211445031 - 2² = 211445027 is a prime.

It is a super-2 number, since 2×211445031² = 89418002269181922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 211444989 and 211445007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211445033) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209055 + ... + 210063.

It is an arithmetic number, because the mean of its divisors is an integer number (10689840).

Almost surely, 2^211445031 is an apocalyptic number.

211445031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

211445031 is a deficient number, since it is larger than the sum of its proper divisors (130629849).

211445031 is a wasteful number, since it uses less digits than its factorization.

211445031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 211445031 is about 14541.1495762887. The cubic root of 211445031 is about 595.7524374217.

Adding to 211445031 its reverse (130544112), we get a palindrome (341989143).

The spelling of 211445031 in words is "two hundred eleven million, four hundred forty-five thousand, thirty-one".