2100121651 has 8 divisors (see below), whose sum is σ = 2191954464. Its totient is φ = 2008332480.

The previous prime is 2100121643. The next prime is 2100121679. The reversal of 2100121651 is 1561210012.

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

It is a cyclic number.

It is not a de Polignac number, because 2100121651 - 2³ = 2100121643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2100121631) 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, 122041 + ... + 138181.

It is an arithmetic number, because the mean of its divisors is an integer number (273994308).

Almost surely, 2^2100121651 is an apocalyptic number.

2100121651 is a deficient number, since it is larger than the sum of its proper divisors (91832813).

2100121651 is a wasteful number, since it uses less digits than its factorization.

2100121651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21821.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 2100121651 is about 45827.0842515646. The cubic root of 2100121651 is about 1280.6038920872.

Adding to 2100121651 its reverse (1561210012), we get a palindrome (3661331663).

The spelling of 2100121651 in words is "two billion, one hundred million, one hundred twenty-one thousand, six hundred fifty-one".