1212721041 has 24 divisors (see below), whose sum is σ = 1906738464. Its totient is φ = 683484480.

The previous prime is 1212721033. The next prime is 1212721049. The reversal of 1212721041 is 1401272121.

It is an interprime number because it is at equal distance from previous prime (1212721033) and next prime (1212721049).

It is not a de Polignac number, because 1212721041 - 2³ = 1212721033 is a prime.

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 = 1212720999 and 1212721017.

It is not an unprimeable number, because it can be changed into a prime (1212721049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45775 + ... + 67236.

It is an arithmetic number, because the mean of its divisors is an integer number (79447436).

Almost surely, 2^1212721041 is an apocalyptic number.

It is an amenable number.

1212721041 is a deficient number, since it is larger than the sum of its proper divisors (694017423).

1212721041 is a wasteful number, since it uses less digits than its factorization.

1212721041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113101 (or 113094 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 1212721041 is about 34824.1445121054. The cubic root of 1212721041 is about 1066.4004121364.

Adding to 1212721041 its reverse (1401272121), we get a palindrome (2613993162).

The spelling of 1212721041 in words is "one billion, two hundred twelve million, seven hundred twenty-one thousand, forty-one".