1221002029 has 16 divisors (see below), whose sum is σ = 1333266480. Its totient is φ = 1111449600.

The previous prime is 1221002023. The next prime is 1221002039. The reversal of 1221002029 is 9202001221.

It can be written as a sum of positive squares in 8 ways, for example, as 278389225 + 942612804 = 16685^2 + 30702^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221002029 - 2³ = 1221002021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221001997 and 1221002015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002021) 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 15 ways as a sum of consecutive naturals, for example, 351469 + ... + 354925.

It is an arithmetic number, because the mean of its divisors is an integer number (83329155).

Almost surely, 2^1221002029 is an apocalyptic number.

It is an amenable number.

1221002029 is a deficient number, since it is larger than the sum of its proper divisors (112264451).

1221002029 is a wasteful number, since it uses less digits than its factorization.

1221002029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1221002029 is about 34942.8394524543. The cubic root of 1221002029 is about 1068.8221904704.

The spelling of 1221002029 in words is "one billion, two hundred twenty-one million, two thousand, twenty-nine".