1721321632 has 12 divisors (see below), whose sum is σ = 3388852026. Its totient is φ = 860660800.

The previous prime is 1721321629. The next prime is 1721321647. The reversal of 1721321632 is 2361231271.

It can be written as a sum of positive squares in only one way, i.e., 1302055056 + 419266576 = 36084^2 + 20476^2 .

It is a super-2 number, since 2×1721321632² = 5925896321582286848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1721321632.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26895619 + ... + 26895682.

Almost surely, 2^1721321632 is an apocalyptic number.

It is an amenable number.

1721321632 is a deficient number, since it is larger than the sum of its proper divisors (1667530394).

1721321632 is an equidigital number, since it uses as much as digits as its factorization.

1721321632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53791311 (or 53791303 counting only the distinct ones).

The product of its digits is 3024, while the sum is 28.

The square root of 1721321632 is about 41488.8133356451. The cubic root of 1721321632 is about 1198.4520856410.

The spelling of 1721321632 in words is "one billion, seven hundred twenty-one million, three hundred twenty-one thousand, six hundred thirty-two".