2011155151221 has 48 divisors (see below), whose sum is σ = 3065270155584. Its totient is φ = 1317427524864.

The previous prime is 2011155151219. The next prime is 2011155151231. The reversal of 2011155151221 is 1221515511102.

2011155151221 is a `hidden beast` number, since 2 + 0 + 1 + 115 + 515 + 12 + 21 = 666.

It is not a de Polignac number, because 2011155151221 - 2¹ = 2011155151219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011155151231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6307981 + ... + 6619133.

It is an arithmetic number, because the mean of its divisors is an integer number (63859794908).

Almost surely, 2^{2011155151221} is an apocalyptic number.

It is an amenable number.

2011155151221 is a deficient number, since it is larger than the sum of its proper divisors (1054115004363).

2011155151221 is an equidigital number, since it uses as much as digits as its factorization.

2011155151221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311632 (or 311620 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 27.

The spelling of 2011155151221 in words is "two trillion, eleven billion, one hundred fifty-five million, one hundred fifty-one thousand, two hundred twenty-one".