121421511 has 28 divisors (see below), whose sum is σ = 183204288. Its totient is φ = 80434944.

The previous prime is 121421491. The next prime is 121421519. The reversal of 121421511 is 115124121.

121421511 is a `hidden beast` number, since 12 + 142 + 1 + 511 = 666.

It is not a de Polignac number, because 121421511 - 2⁵ = 121421479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121421519) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 140266 + ... + 141128.

Almost surely, 2^121421511 is an apocalyptic number.

121421511 is a deficient number, since it is larger than the sum of its proper divisors (61782777).

121421511 is an frugal number, since it uses more digits than its factorization.

121421511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074 (or 1059 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 121421511 is about 11019.1429340035. The cubic root of 121421511 is about 495.1824121100.

Adding to 121421511 its reverse (115124121), we get a palindrome (236545632).

The spelling of 121421511 in words is "one hundred twenty-one million, four hundred twenty-one thousand, five hundred eleven".