2154221450 has 12 divisors (see below), whose sum is σ = 4006851990. Its totient is φ = 861688560.

The previous prime is 2154221389. The next prime is 2154221473. The reversal of 2154221450 is 541224512.

It can be written as a sum of positive squares in 3 ways, for example, as 1102970521 + 1051250929 = 33211^2 + 32423^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21542165 + ... + 21542264.

Almost surely, 2^2154221450 is an apocalyptic number.

2154221450 is a deficient number, since it is larger than the sum of its proper divisors (1852630540).

2154221450 is a wasteful number, since it uses less digits than its factorization.

2154221450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43084441 (or 43084436 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2154221450 is about 46413.5912206759. The cubic root of 2154221450 is about 1291.5070522621.

Adding to 2154221450 its reverse (541224512), we get a palindrome (2695445962).

The spelling of 2154221450 in words is "two billion, one hundred fifty-four million, two hundred twenty-one thousand, four hundred fifty".