2145366621 has 16 divisors (see below), whose sum is σ = 3252237120. Its totient is φ = 1396982160.

The previous prime is 2145366617. The next prime is 2145366631. The reversal of 2145366621 is 1266635412.

It is not a de Polignac number, because 2145366621 - 2² = 2145366617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145366631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 922770 + ... + 925091.

It is an arithmetic number, because the mean of its divisors is an integer number (203264820).

Almost surely, 2^2145366621 is an apocalyptic number.

It is an amenable number.

2145366621 is a deficient number, since it is larger than the sum of its proper divisors (1106870499).

2145366621 is a wasteful number, since it uses less digits than its factorization.

2145366621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847913 (or 1847907 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 2145366621 is about 46318.1025194254. The cubic root of 2145366621 is about 1289.7350618702.

The spelling of 2145366621 in words is "two billion, one hundred forty-five million, three hundred sixty-six thousand, six hundred twenty-one".