2121150021 has 8 divisors (see below), whose sum is σ = 2828817984. Its totient is φ = 1413791040.

The previous prime is 2121149969. The next prime is 2121150029. The reversal of 2121150021 is 1200511212.

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

It is not a de Polignac number, because 2121150021 - 2⁶ = 2121149957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121150029) 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, 60721 + ... + 89046.

It is an arithmetic number, because the mean of its divisors is an integer number (353602248).

Almost surely, 2^2121150021 is an apocalyptic number.

It is an amenable number.

2121150021 is a deficient number, since it is larger than the sum of its proper divisors (707667963).

2121150021 is a wasteful number, since it uses less digits than its factorization.

2121150021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154491.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 2121150021 is about 46055.9444697424. The cubic root of 2121150021 is about 1284.8639039904.

Adding to 2121150021 its reverse (1200511212), we get a palindrome (3321661233).

The spelling of 2121150021 in words is "two billion, one hundred twenty-one million, one hundred fifty thousand, twenty-one".