2129807942661 has 8 divisors (see below), whose sum is σ = 3245421626944. Its totient is φ = 1217033110080.

The previous prime is 2129807942641. The next prime is 2129807942671. The reversal of 2129807942661 is 1662497089212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2129807942661 - 2¹¹ = 2129807940613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129807942611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50709712900 + ... + 50709712941.

It is an arithmetic number, because the mean of its divisors is an integer number (405677703368).

Almost surely, 2^{2129807942661} is an apocalyptic number.

2129807942661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2129807942661 is a deficient number, since it is larger than the sum of its proper divisors (1115613684283).

2129807942661 is a wasteful number, since it uses less digits than its factorization.

2129807942661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101419425851.

The product of its (nonzero) digits is 5225472, while the sum is 57.

The spelling of 2129807942661 in words is "two trillion, one hundred twenty-nine billion, eight hundred seven million, nine hundred forty-two thousand, six hundred sixty-one".