1165101421 has 4 divisors (see below), whose sum is σ = 1271019744. Its totient is φ = 1059183100.

The previous prime is 1165101407. The next prime is 1165101433. The reversal of 1165101421 is 1241015611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1241015611 = 11 ⋅112819601.

It is a cyclic number.

It is not a de Polignac number, because 1165101421 - 2²⁵ = 1131546989 is a prime.

It is a super-2 number, since 2×1165101421² = 2714922642432438482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1165101392 and 1165101401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165101481) 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, 52959145 + ... + 52959166.

It is an arithmetic number, because the mean of its divisors is an integer number (317754936).

Almost surely, 2^1165101421 is an apocalyptic number.

1165101421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1165101421 is a deficient number, since it is larger than the sum of its proper divisors (105918323).

1165101421 is a wasteful number, since it uses less digits than its factorization.

1165101421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105918322.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1165101421 is about 34133.5820124405. The cubic root of 1165101421 is about 1052.2555958366.

The spelling of 1165101421 in words is "one billion, one hundred sixty-five million, one hundred one thousand, four hundred twenty-one".