2161621243342 has 64 divisors (see below), whose sum is σ = 3702745255104. Its totient is φ = 937767075840.

The previous prime is 2161621243333. The next prime is 2161621243349. The reversal of 2161621243342 is 2433421261612.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161621243349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8801118 + ... + 9043390.

It is an arithmetic number, because the mean of its divisors is an integer number (57855394611).

Almost surely, 2^{2161621243342} is an apocalyptic number.

2161621243342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2161621243342 is a deficient number, since it is larger than the sum of its proper divisors (1541124011762).

2161621243342 is a wasteful number, since it uses less digits than its factorization.

2161621243342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242533.

The product of its digits is 82944, while the sum is 37.

The spelling of 2161621243342 in words is "two trillion, one hundred sixty-one billion, six hundred twenty-one million, two hundred forty-three thousand, three hundred forty-two".