1229721902 has 4 divisors (see below), whose sum is σ = 1844582856. Its totient is φ = 614860950.

The previous prime is 1229721901. The next prime is 1229721931. The reversal of 1229721902 is 2091279221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2091279221 = 1423 ⋅1469627.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229721901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307430474 + ... + 307430477.

It is an arithmetic number, because the mean of its divisors is an integer number (461145714).

Almost surely, 2^1229721902 is an apocalyptic number.

1229721902 is a deficient number, since it is larger than the sum of its proper divisors (614860954).

1229721902 is an equidigital number, since it uses as much as digits as its factorization.

1229721902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614860953.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1229721902 is about 35067.3908638781. The cubic root of 1229721902 is about 1071.3605140991.

The spelling of 1229721902 in words is "one billion, two hundred twenty-nine million, seven hundred twenty-one thousand, nine hundred two".