2126121661357 has 16 divisors (see below), whose sum is σ = 2184045402880. Its totient is φ = 2068598347200.

The previous prime is 2126121661303. The next prime is 2126121661379. The reversal of 2126121661357 is 7531661216212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2126121661357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2126121671357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11877244 + ... + 12054922.

It is an arithmetic number, because the mean of its divisors is an integer number (136502837680).

Almost surely, 2^{2126121661357} is an apocalyptic number.

It is an amenable number.

2126121661357 is a deficient number, since it is larger than the sum of its proper divisors (57923741523).

2126121661357 is a wasteful number, since it uses less digits than its factorization.

2126121661357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178804.

The product of its digits is 181440, while the sum is 43.

Adding to 2126121661357 its reverse (7531661216212), we get a palindrome (9657782877569).

The spelling of 2126121661357 in words is "two trillion, one hundred twenty-six billion, one hundred twenty-one million, six hundred sixty-one thousand, three hundred fifty-seven".