1267142921 has 8 divisors (see below), whose sum is σ = 1408420224. Its totient is φ = 1130212720.

The previous prime is 1267142897. The next prime is 1267142999. The reversal of 1267142921 is 1292417621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1267142921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1267142221) 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, 1086161 + ... + 1087326.

It is an arithmetic number, because the mean of its divisors is an integer number (176052528).

Almost surely, 2^1267142921 is an apocalyptic number.

1267142921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1267142921 is a deficient number, since it is larger than the sum of its proper divisors (141277303).

1267142921 is a wasteful number, since it uses less digits than its factorization.

1267142921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173551.

The product of its digits is 12096, while the sum is 35.

The square root of 1267142921 is about 35596.9510070736. The cubic root of 1267142921 is about 1082.1194436629.

The spelling of 1267142921 in words is "one billion, two hundred sixty-seven million, one hundred forty-two thousand, nine hundred twenty-one".