101421 has 12 divisors (see below), whose sum is σ = 149760. Its totient is φ = 66120.

The previous prime is 101419. The next prime is 101429. The reversal of 101421 is 124101.

It is a happy number.

It is not a de Polignac number, because 101421 - 2¹ = 101419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 101421.

It is not an unprimeable number, because it can be changed into a prime (101429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 436 + ... + 626.

It is an arithmetic number, because the mean of its divisors is an integer number (12480).

2¹⁰¹⁴²¹ is an apocalyptic number.

It is an amenable number.

101421 is a deficient number, since it is larger than the sum of its proper divisors (48339).

101421 is a wasteful number, since it uses less digits than its factorization.

101421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 101421 is about 318.4666387551. The cubic root of 101421 is about 46.6347116839.

Adding to 101421 its reverse (124101), we get a palindrome (225522).

It can be divided in two parts, 1014 and 21, that added together give a triangular number (1035 = T₄₅).

The spelling of 101421 in words is "one hundred one thousand, four hundred twenty-one", and thus it is an iban number.