2121230029 has 4 divisors (see below), whose sum is σ = 2246008284. Its totient is φ = 1996451776.

The previous prime is 2121229973. The next prime is 2121230051. The reversal of 2121230029 is 9200321212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 871607529 + 1249622500 = 29523^2 + 35350^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121230029 - 2²¹ = 2119132877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121229991 and 2121230009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121230099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62389102 + ... + 62389135.

It is an arithmetic number, because the mean of its divisors is an integer number (561502071).

Almost surely, 2^2121230029 is an apocalyptic number.

It is an amenable number.

2121230029 is a deficient number, since it is larger than the sum of its proper divisors (124778255).

2121230029 is a wasteful number, since it uses less digits than its factorization.

2121230029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124778254.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2121230029 is about 46056.8130573534. The cubic root of 2121230029 is about 1284.8800584503.

The spelling of 2121230029 in words is "two billion, one hundred twenty-one million, two hundred thirty thousand, twenty-nine".