121421104 has 40 divisors (see below), whose sum is σ = 272284160. Its totient is φ = 51375168.

The previous prime is 121421101. The next prime is 121421107. The reversal of 121421104 is 401124121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121421101) and next prime (121421107).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (121421101) 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, 1987 + ... + 15709.

It is an arithmetic number, because the mean of its divisors is an integer number (6807104).

Almost surely, 2^121421104 is an apocalyptic number.

121421104 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121421104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136142080).

121421104 is an abundant number, since it is smaller than the sum of its proper divisors (150863056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121421104 is a wasteful number, since it uses less digits than its factorization.

121421104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13817 (or 13811 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 121421104 is about 11019.1244661271. The cubic root of 121421104 is about 495.1818588323.

Adding to 121421104 its reverse (401124121), we get a palindrome (522545225).

The spelling of 121421104 in words is "one hundred twenty-one million, four hundred twenty-one thousand, one hundred four".