2011121701521 has 8 divisors (see below), whose sum is σ = 2695389362400. Its totient is φ = 1333800920832.

The previous prime is 2011121701451. The next prime is 2011121701531. The reversal of 2011121701521 is 1251071211102.

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

It is not a de Polignac number, because 2011121701521 - 2⁹ = 2011121701009 is a prime.

It is a super-2 number, since 2×2011121701521² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2011121701491 and 2011121701500.

It is not an unprimeable number, because it can be changed into a prime (2011121701531) 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, 1736719371 + ... + 1736720528.

It is an arithmetic number, because the mean of its divisors is an integer number (336923670300).

Almost surely, 2^{2011121701521} is an apocalyptic number.

It is an amenable number.

2011121701521 is a deficient number, since it is larger than the sum of its proper divisors (684267660879).

2011121701521 is a wasteful number, since it uses less digits than its factorization.

2011121701521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473440095.

The product of its (nonzero) digits is 280, while the sum is 24.

Adding to 2011121701521 its reverse (1251071211102), we get a palindrome (3262192912623).

The spelling of 2011121701521 in words is "two trillion, eleven billion, one hundred twenty-one million, seven hundred one thousand, five hundred twenty-one".