1267199421 has 64 divisors (see below), whose sum is σ = 1881784320. Its totient is φ = 756138240.

The previous prime is 1267199411. The next prime is 1267199441. The reversal of 1267199421 is 1249917621.

It is not a de Polignac number, because 1267199421 - 2⁹ = 1267198909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1267199411) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12302856 + ... + 12302958.

It is an arithmetic number, because the mean of its divisors is an integer number (29402880).

Almost surely, 2^1267199421 is an apocalyptic number.

It is an amenable number.

1267199421 is a deficient number, since it is larger than the sum of its proper divisors (614584899).

1267199421 is a wasteful number, since it uses less digits than its factorization.

1267199421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306.

The product of its digits is 54432, while the sum is 42.

The square root of 1267199421 is about 35597.7446055224. The cubic root of 1267199421 is about 1082.1355267842.

The spelling of 1267199421 in words is "one billion, two hundred sixty-seven million, one hundred ninety-nine thousand, four hundred twenty-one".