1221412141 has 8 divisors (see below), whose sum is σ = 1304706744. Its totient is φ = 1139389440.

The previous prime is 1221412139. The next prime is 1221412201. The reversal of 1221412141 is 1412141221.

1221412141 = T₂₈₅₃₄ + T₂₈₅₃₅ + T₂₈₅₃₆.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25704900 + 1195707241 = 5070^2 + 34579^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221412141 - 2¹ = 1221412139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221412441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315990 + ... + 319831.

It is an arithmetic number, because the mean of its divisors is an integer number (163088343).

Almost surely, 2^1221412141 is an apocalyptic number.

1221412141 is the 28536-th centered triangular number.

It is an amenable number.

1221412141 is a deficient number, since it is larger than the sum of its proper divisors (83294603).

1221412141 is a wasteful number, since it uses less digits than its factorization.

1221412141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635951.

The product of its digits is 128, while the sum is 19.

The square root of 1221412141 is about 34948.7072865364. The cubic root of 1221412141 is about 1068.9418429439.

Adding to 1221412141 its reverse (1412141221), we get a palindrome (2633553362).

The spelling of 1221412141 in words is "one billion, two hundred twenty-one million, four hundred twelve thousand, one hundred forty-one".