2121011501 has 16 divisors (see below), whose sum is σ = 2484470400. Its totient is φ = 1809934560.

The previous prime is 2121011479. The next prime is 2121011509. The reversal of 2121011501 is 1051101212.

It is not a de Polignac number, because 2121011501 - 2¹⁸ = 2120749357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121011509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64241 + ... + 91481.

It is an arithmetic number, because the mean of its divisors is an integer number (155279400).

Almost surely, 2^2121011501 is an apocalyptic number.

It is an amenable number.

2121011501 is a deficient number, since it is larger than the sum of its proper divisors (363458899).

2121011501 is an equidigital number, since it uses as much as digits as its factorization.

2121011501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27489 (or 27475 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 2121011501 is about 46054.4406219422. The cubic root of 2121011501 is about 1284.8359343795.

Adding to 2121011501 its reverse (1051101212), we get a palindrome (3172112713).

The spelling of 2121011501 in words is "two billion, one hundred twenty-one million, eleven thousand, five hundred one".