2121401623 has 32 divisors (see below), whose sum is σ = 2563303680. Its totient is φ = 1734048000.

The previous prime is 2121401587. The next prime is 2121401647. The reversal of 2121401623 is 3261041212.

It is a cyclic number.

It is not a de Polignac number, because 2121401623 - 2²¹ = 2119304471 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121401594 and 2121401603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121401923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 313708 + ... + 320398.

It is an arithmetic number, because the mean of its divisors is an integer number (80103240).

Almost surely, 2^2121401623 is an apocalyptic number.

2121401623 is a deficient number, since it is larger than the sum of its proper divisors (441902057).

2121401623 is a wasteful number, since it uses less digits than its factorization.

2121401623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6799.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 2121401623 is about 46058.6758711103. The cubic root of 2121401623 is about 1284.9147037207.

Adding to 2121401623 its reverse (3261041212), we get a palindrome (5382442835).

The spelling of 2121401623 in words is "two billion, one hundred twenty-one million, four hundred one thousand, six hundred twenty-three".