1242221047 has 4 divisors (see below), whose sum is σ = 1242546480. Its totient is φ = 1241895616.

The previous prime is 1242221039. The next prime is 1242221063. The reversal of 1242221047 is 7401222421.

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

It is a cyclic number.

It is not a de Polignac number, because 1242221047 - 2³ = 1242221039 is a prime.

It is a super-2 number, since 2×1242221047² = 3086226259219552418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242221027) 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, 156922 + ... + 164647.

It is an arithmetic number, because the mean of its divisors is an integer number (310636620).

Almost surely, 2^1242221047 is an apocalyptic number.

1242221047 is a deficient number, since it is larger than the sum of its proper divisors (325433).

1242221047 is an equidigital number, since it uses as much as digits as its factorization.

1242221047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325432.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 1242221047 is about 35245.1563622578. The cubic root of 1242221047 is about 1074.9781274079.

Adding to 1242221047 its reverse (7401222421), we get a palindrome (8643443468).

The spelling of 1242221047 in words is "one billion, two hundred forty-two million, two hundred twenty-one thousand, forty-seven".