2154221654 has 32 divisors (see below), whose sum is σ = 3614096640. Its totient is φ = 956606112.

The previous prime is 2154221621. The next prime is 2154221723. The reversal of 2154221654 is 4561224512.

It is a self number, because there is not a number n which added to its sum of digits gives 2154221654.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60527 + ... + 89285.

It is an arithmetic number, because the mean of its divisors is an integer number (112940520).

Almost surely, 2^2154221654 is an apocalyptic number.

2154221654 is a deficient number, since it is larger than the sum of its proper divisors (1459874986).

2154221654 is a wasteful number, since it uses less digits than its factorization.

2154221654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28884.

The product of its digits is 19200, while the sum is 32.

The square root of 2154221654 is about 46413.5934183080. The cubic root of 2154221654 is about 1291.5070930297.

The spelling of 2154221654 in words is "two billion, one hundred fifty-four million, two hundred twenty-one thousand, six hundred fifty-four".