2126121661356 has 48 divisors (see below), whose sum is σ = 6185081199360. Its totient is φ = 552239392320.

The previous prime is 2126121661303. The next prime is 2126121661379. The reversal of 2126121661356 is 6531661216212.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1150497811 + ... + 1150499658.

It is an arithmetic number, because the mean of its divisors is an integer number (128855858320).

Almost surely, 2^{2126121661356} is an apocalyptic number.

It is an amenable number.

2126121661356 is an abundant number, since it is smaller than the sum of its proper divisors (4058959538004).

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

2126121661356 is a wasteful number, since it uses less digits than its factorization.

2126121661356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300997494 (or 2300997492 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

Adding to 2126121661356 its reverse (6531661216212), we get a palindrome (8657782877568).

The spelling of 2126121661356 in words is "two trillion, one hundred twenty-six billion, one hundred twenty-one million, six hundred sixty-one thousand, three hundred fifty-six".