2169402006321 has 27 divisors (see below), whose sum is σ = 3444426179467. Its totient is φ = 1314759636960.

The previous prime is 2169402006283. The next prime is 2169402006347. The reversal of 2169402006321 is 1236002049612.

It is a happy number.

The square root of 2169402006321 is 1472889.

It is a perfect power (a square), and thus also a powerful number.

2169402006321 is a `hidden beast` number, since 2 + 16 + 9 + 4 + 0 + 2 + 0 + 0 + 632 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1911403026225 + 257998980096 = 1382535^2 + 507936^2 .

It is not a de Polignac number, because 2169402006321 - 2³¹ = 2167254522673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2169402056321) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 48583021 + ... + 48627653.

Almost surely, 2^{2169402006321} is an apocalyptic number.

2169402006321 is the 1472889-th square number.

2169402006321 is the 736445-th centered octagonal number.

It is an amenable number.

2169402006321 is a deficient number, since it is larger than the sum of its proper divisors (1275024173146).

2169402006321 is an frugal number, since it uses more digits than its factorization.

2169402006321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89294 (or 44647 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

Multiplying 2169402006321 by its sum of digits (36), we get a square (78098472227556 = 8837334²).

The spelling of 2169402006321 in words is "two trillion, one hundred sixty-nine billion, four hundred two million, six thousand, three hundred twenty-one".