1209229021 has 16 divisors (see below), whose sum is σ = 1623581568. Its totient is φ = 869774400.

The previous prime is 1209229009. The next prime is 1209229033.

1209229021 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (1209229009) and next prime (1209229033).

It is not a de Polignac number, because 1209229021 - 2⁷ = 1209228893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209229081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 603010 + ... + 605011.

It is an arithmetic number, because the mean of its divisors is an integer number (101473848).

Almost surely, 2^1209229021 is an apocalyptic number.

1209229021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1209229021 is a deficient number, since it is larger than the sum of its proper divisors (414352547).

1209229021 is a wasteful number, since it uses less digits than its factorization.

1209229021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208052.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1209229021 is about 34773.9704520493. The cubic root of 1209229021 is about 1065.3758644526.

The spelling of 1209229021 in words is "one billion, two hundred nine million, two hundred twenty-nine thousand, twenty-one".