1210440021 has 64 divisors (see below), whose sum is σ = 1995964416. Its totient is φ = 637560000.

The previous prime is 1210440017. The next prime is 1210440029. The reversal of 1210440021 is 1200440121.

It is not a de Polignac number, because 1210440021 - 2² = 1210440017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210440029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1611396 + ... + 1612146.

It is an arithmetic number, because the mean of its divisors is an integer number (31186944).

Almost surely, 2^1210440021 is an apocalyptic number.

It is an amenable number.

1210440021 is a deficient number, since it is larger than the sum of its proper divisors (785524395).

1210440021 is a wasteful number, since it uses less digits than its factorization.

1210440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1210440021 is about 34791.3785441164. The cubic root of 1210440021 is about 1065.7313911842.

Adding to 1210440021 its reverse (1200440121), we get a palindrome (2410880142).

It can be divided in two parts, 12104 and 40021, that added together give a palindrome (52125).

The spelling of 1210440021 in words is "one billion, two hundred ten million, four hundred forty thousand, twenty-one".