10121421 has 8 divisors (see below), whose sum is σ = 13586400. Its totient is φ = 6702032.

The previous prime is 10121417. The next prime is 10121429. The reversal of 10121421 is 12412101.

It is a happy number.

10121421 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 10121421 - 2² = 10121417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10121397 and 10121406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121429) 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, 10875 + ... + 11768.

It is an arithmetic number, because the mean of its divisors is an integer number (1698300).

Almost surely, 2^10121421 is an apocalyptic number.

It is an amenable number.

10121421 is a deficient number, since it is larger than the sum of its proper divisors (3464979).

10121421 is a wasteful number, since it uses less digits than its factorization.

10121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22795.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 10121421 is about 3181.4180800392. The cubic root of 10121421 is about 216.3119421163.

Adding to 10121421 its reverse (12412101), we get a palindrome (22533522).

The spelling of 10121421 in words is "ten million, one hundred twenty-one thousand, four hundred twenty-one".