121003621 has 4 divisors (see below), whose sum is σ = 126264672. Its totient is φ = 115742572.

The previous prime is 121003613. The next prime is 121003627. The reversal of 121003621 is 126300121.

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: 126300121 = 787 ⋅160483.

It is a cyclic number.

It is not a de Polignac number, because 121003621 - 2³ = 121003613 is a prime.

It is a super-2 number, since 2×121003621² = 29283752590223282, 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 = 121003595 and 121003604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121003627) 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, 2630491 + ... + 2630536.

It is an arithmetic number, because the mean of its divisors is an integer number (31566168).

Almost surely, 2^121003621 is an apocalyptic number.

It is an amenable number.

121003621 is a deficient number, since it is larger than the sum of its proper divisors (5261051).

121003621 is an equidigital number, since it uses as much as digits as its factorization.

121003621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261050.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 121003621 is about 11000.1645896777. The cubic root of 121003621 is about 494.6136781001.

Adding to 121003621 its reverse (126300121), we get a palindrome (247303742).

The spelling of 121003621 in words is "one hundred twenty-one million, three thousand, six hundred twenty-one".