121421415 has 16 divisors (see below), whose sum is σ = 197460576. Its totient is φ = 63696000.

The previous prime is 121421413. The next prime is 121421423. The reversal of 121421415 is 514124121.

It is not a de Polignac number, because 121421415 - 2¹ = 121421413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121421391 and 121421400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121421413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65436 + ... + 67265.

It is an arithmetic number, because the mean of its divisors is an integer number (12341286).

Almost surely, 2^121421415 is an apocalyptic number.

121421415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121421415 is a deficient number, since it is larger than the sum of its proper divisors (76039161).

121421415 is a wasteful number, since it uses less digits than its factorization.

121421415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132770.

The product of its digits is 320, while the sum is 21.

The square root of 121421415 is about 11019.1385779470. The cubic root of 121421415 is about 495.1822816073.

Adding to 121421415 its reverse (514124121), we get a palindrome (635545536).

The spelling of 121421415 in words is "one hundred twenty-one million, four hundred twenty-one thousand, four hundred fifteen".