1221213029 has 8 divisors (see below), whose sum is σ = 1250483520. Its totient is φ = 1191982176.

The previous prime is 1221213023. The next prime is 1221213053. The reversal of 1221213029 is 9203121221.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221213029 is a prime.

It is a super-2 number, since 2×1221213029² = 2982722524398709682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221212995 and 1221213013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221213023) 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, 57929 + ... + 76145.

It is an arithmetic number, because the mean of its divisors is an integer number (156310440).

Almost surely, 2^1221213029 is an apocalyptic number.

It is an amenable number.

1221213029 is a deficient number, since it is larger than the sum of its proper divisors (29270491).

1221213029 is a wasteful number, since it uses less digits than its factorization.

1221213029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19819.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1221213029 is about 34945.8585386023. The cubic root of 1221213029 is about 1068.8837542482.

The spelling of 1221213029 in words is "one billion, two hundred twenty-one million, two hundred thirteen thousand, twenty-nine".