121541021 has 20 divisors (see below), whose sum is σ = 143052672. Its totient is φ = 103253976.

The previous prime is 121541009. The next prime is 121541023. The reversal of 121541021 is 120145121.

It is not a de Polignac number, because 121541021 - 2¹⁰ = 121539997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121541023) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 535310 + ... + 535536.

Almost surely, 2^121541021 is an apocalyptic number.

It is an amenable number.

121541021 is a deficient number, since it is larger than the sum of its proper divisors (21511651).

121541021 is an frugal number, since it uses more digits than its factorization.

121541021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 121541021 is about 11024.5644358405. The cubic root of 121541021 is about 495.3448211272.

Adding to 121541021 its reverse (120145121), we get a palindrome (241686142).

The spelling of 121541021 in words is "one hundred twenty-one million, five hundred forty-one thousand, twenty-one".