127691421 has 24 divisors (see below), whose sum is σ = 201542880. Its totient is φ = 71433120.

The previous prime is 127691401. The next prime is 127691461. The reversal of 127691421 is 124196721.

It is a happy number.

It is not a de Polignac number, because 127691421 - 2⁶ = 127691357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127691401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8811 + ... + 18248.

It is an arithmetic number, because the mean of its divisors is an integer number (8397620).

Almost surely, 2^127691421 is an apocalyptic number.

127691421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

127691421 is a deficient number, since it is larger than the sum of its proper divisors (73851459).

127691421 is a wasteful number, since it uses less digits than its factorization.

127691421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27097 (or 27086 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 127691421 is about 11300.0628759313. The cubic root of 127691421 is about 503.5631095193.

The spelling of 127691421 in words is "one hundred twenty-seven million, six hundred ninety-one thousand, four hundred twenty-one".