1210211001 has 6 divisors (see below), whose sum is σ = 1748082570. Its totient is φ = 806807328.

The previous prime is 1210210999. The next prime is 1210211029. The reversal of 1210211001 is 1001120121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1204159401 + 6051600 = 34701^2 + 2460^2 .

It is not a de Polignac number, because 1210211001 - 2¹ = 1210210999 is a prime.

It is a super-2 number, since 2×1210211001² = 2929221333882844002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 134467889 = 1210211001 / (1 + 2 + 1 + 0 + 2 + 1 + 1 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (1210215001) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 67233936 + ... + 67233953.

It is an arithmetic number, because the mean of its divisors is an integer number (291347095).

Almost surely, 2^1210211001 is an apocalyptic number.

It is an amenable number.

1210211001 is a deficient number, since it is larger than the sum of its proper divisors (537871569).

1210211001 is a wasteful number, since it uses less digits than its factorization.

1210211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134467895 (or 134467892 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1210211001 is about 34788.0870557724. The cubic root of 1210211001 is about 1065.6641734248.

Adding to 1210211001 its reverse (1001120121), we get a palindrome (2211331122).

The spelling of 1210211001 in words is "one billion, two hundred ten million, two hundred eleven thousand, one".