2161027421 has 16 divisors (see below), whose sum is σ = 2484840960. Its totient is φ = 1841022000.

The previous prime is 2161027417. The next prime is 2161027457. The reversal of 2161027421 is 1247201612.

It is a cyclic number.

It is not a de Polignac number, because 2161027421 - 2² = 2161027417 is a prime.

It is a super-2 number, since 2×2161027421² = 9340079028627822482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161027621) 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, 1086590 + ... + 1088576.

It is an arithmetic number, because the mean of its divisors is an integer number (155302560).

Almost surely, 2^2161027421 is an apocalyptic number.

It is an amenable number.

2161027421 is a deficient number, since it is larger than the sum of its proper divisors (323813539).

2161027421 is a wasteful number, since it uses less digits than its factorization.

2161027421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 2161027421 is about 46486.8521304680. The cubic root of 2161027421 is about 1292.8657362949.

The spelling of 2161027421 in words is "two billion, one hundred sixty-one million, twenty-seven thousand, four hundred twenty-one".