2151211541444 has 144 divisors (see below), whose sum is σ = 4675855464000. Its totient is φ = 860957475840.

The previous prime is 2151211541441. The next prime is 2151211541459. The reversal of 2151211541444 is 4441451121512.

It is a super-2 number, since 2×2151211541444² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2151211541441) 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, 109695512 + ... + 109715120.

It is an arithmetic number, because the mean of its divisors is an integer number (32471218500).

Almost surely, 2^{2151211541444} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151211541444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2337927732000).

2151211541444 is an abundant number, since it is smaller than the sum of its proper divisors (2524643922556).

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

2151211541444 is a wasteful number, since it uses less digits than its factorization.

2151211541444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20066 (or 20057 counting only the distinct ones).

The product of its digits is 25600, while the sum is 35.

Adding to 2151211541444 its reverse (4441451121512), we get a palindrome (6592662662956).

The spelling of 2151211541444 in words is "two trillion, one hundred fifty-one billion, two hundred eleven million, five hundred forty-one thousand, four hundred forty-four".