2151542121 has 8 divisors (see below), whose sum is σ = 3019708320. Its totient is φ = 1358868672.

The previous prime is 2151542111. The next prime is 2151542143. The reversal of 2151542121 is 1212451512.

It is a happy number.

2151542121 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2151542121 - 2⁷ = 2151541993 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2151542091 and 2151542100.

It is not an unprimeable number, because it can be changed into a prime (2151542101) 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, 18873120 + ... + 18873233.

It is an arithmetic number, because the mean of its divisors is an integer number (377463540).

Almost surely, 2^2151542121 is an apocalyptic number.

It is an amenable number.

2151542121 is a deficient number, since it is larger than the sum of its proper divisors (868166199).

2151542121 is a wasteful number, since it uses less digits than its factorization.

2151542121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37746375.

The product of its digits is 800, while the sum is 24.

The square root of 2151542121 is about 46384.7186150784. The cubic root of 2151542121 is about 1290.9713896120.

Adding to 2151542121 its reverse (1212451512), we get a palindrome (3363993633).

It can be divided in two parts, 21515 and 42121, that added together give a palindrome (63636).

The spelling of 2151542121 in words is "two billion, one hundred fifty-one million, five hundred forty-two thousand, one hundred twenty-one".