1421220243 has 8 divisors (see below), whose sum is σ = 1901802448. Its totient is φ = 944059104.

The previous prime is 1421220239. The next prime is 1421220253. The reversal of 1421220243 is 3420221241.

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

It is not a de Polignac number, because 1421220243 - 2² = 1421220239 is a prime.

It is a super-2 number, since 2×1421220243² = 4039733958225958098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421220223) 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, 854296 + ... + 855957.

It is an arithmetic number, because the mean of its divisors is an integer number (237725306).

Almost surely, 2^1421220243 is an apocalyptic number.

1421220243 is a deficient number, since it is larger than the sum of its proper divisors (480582205).

1421220243 is a wasteful number, since it uses less digits than its factorization.

1421220243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710533.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1421220243 is about 37699.0748294968. The cubic root of 1421220243 is about 1124.3127306482.

Adding to 1421220243 its reverse (3420221241), we get a palindrome (4841441484).

The spelling of 1421220243 in words is "one billion, four hundred twenty-one million, two hundred twenty thousand, two hundred forty-three".