1221040867 has 2 divisors, whose sum is σ = 1221040868. Its totient is φ = 1221040866.

The previous prime is 1221040841. The next prime is 1221040901. The reversal of 1221040867 is 7680401221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221040867 is a prime.

It is a super-2 number, since 2×1221040867² = 2981881597768223378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221040817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610520433 + 610520434.

It is an arithmetic number, because the mean of its divisors is an integer number (610520434).

Almost surely, 2^1221040867 is an apocalyptic number.

1221040867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221040867 is an equidigital number, since it uses as much as digits as its factorization.

1221040867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 1221040867 is about 34943.3951842119. The cubic root of 1221040867 is about 1068.8335228229.

The spelling of 1221040867 in words is "one billion, two hundred twenty-one million, forty thousand, eight hundred sixty-seven".