1230121221 has 32 divisors (see below), whose sum is σ = 1908707328. Its totient is φ = 690170880.

The previous prime is 1230121201. The next prime is 1230121229. The reversal of 1230121221 is 1221210321.

1230121221 = T₅₈₅₁ + T₅₈₅₂ + ... + T₅₉₂₁.

It is not a de Polignac number, because 1230121221 - 2¹⁰ = 1230120197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1230121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230121229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390565 + ... + 393701.

It is an arithmetic number, because the mean of its divisors is an integer number (59647104).

Almost surely, 2^1230121221 is an apocalyptic number.

It is an amenable number.

1230121221 is a deficient number, since it is larger than the sum of its proper divisors (678586107).

1230121221 is a wasteful number, since it uses less digits than its factorization.

1230121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3481.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1230121221 is about 35073.0839961358. The cubic root of 1230121221 is about 1071.4764666869.

Adding to 1230121221 its reverse (1221210321), we get a palindrome (2451331542).

The spelling of 1230121221 in words is "one billion, two hundred thirty million, one hundred twenty-one thousand, two hundred twenty-one".