1721363401 has 16 divisors (see below), whose sum is σ = 1842407424. Its totient is φ = 1604355984.

The previous prime is 1721363377. The next prime is 1721363471. The reversal of 1721363401 is 1043631271.

It is not a de Polignac number, because 1721363401 - 2²⁹ = 1184492489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1721363401.

It is not an unprimeable number, because it can be changed into a prime (1721363471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460000 + ... + 463726.

It is an arithmetic number, because the mean of its divisors is an integer number (115150464).

Almost surely, 2^1721363401 is an apocalyptic number.

It is an amenable number.

1721363401 is a deficient number, since it is larger than the sum of its proper divisors (121044023).

1721363401 is a wasteful number, since it uses less digits than its factorization.

1721363401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260.

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

The square root of 1721363401 is about 41489.3167092446. The cubic root of 1721363401 is about 1198.4617793049.

Adding to 1721363401 its reverse (1043631271), we get a palindrome (2764994672).

The spelling of 1721363401 in words is "one billion, seven hundred twenty-one million, three hundred sixty-three thousand, four hundred one".