2155701021012 has 720 divisors, whose sum is σ = 7352815998528. Its totient is φ = 544285163520.

The previous prime is 2155701021011. The next prime is 2155701021031. The reversal of 2155701021012 is 2101201075512.

2155701021012 is a `hidden beast` number, since 2 + 1 + 557 + 0 + 1 + 0 + 2 + 101 + 2 = 666.

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 (2155701021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 1929901878 + ... + 1929902994.

Almost surely, 2^{2155701021012} is an apocalyptic number.

2155701021012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155701021012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3676407999264).

2155701021012 is an abundant number, since it is smaller than the sum of its proper divisors (5197114977516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155701021012 is a wasteful number, since it uses less digits than its factorization.

2155701021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458 (or 1440 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

Adding to 2155701021012 its reverse (2101201075512), we get a palindrome (4256902096524).

The spelling of 2155701021012 in words is "two trillion, one hundred fifty-five billion, seven hundred one million, twenty-one thousand, twelve".