2101640533542 has 48 divisors (see below), whose sum is σ = 4967798668560. Its totient is φ = 636824270400.

The previous prime is 2101640533511. The next prime is 2101640533543. The reversal of 2101640533542 is 2453350461012.

2101640533542 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 64 + 0 + 53 + 3 + 542 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2101640533497 and 2101640533506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101640533543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3265084 + ... + 3855392.

It is an arithmetic number, because the mean of its divisors is an integer number (103495805595).

Almost surely, 2^{2101640533542} is an apocalyptic number.

2101640533542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2101640533542 is an abundant number, since it is smaller than the sum of its proper divisors (2866158135018).

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

2101640533542 is a wasteful number, since it uses less digits than its factorization.

2101640533542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608309 (or 608306 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 2101640533542 its reverse (2453350461012), we get a palindrome (4554990994554).

The spelling of 2101640533542 in words is "two trillion, one hundred one billion, six hundred forty million, five hundred thirty-three thousand, five hundred forty-two".