1722401262421 has 4 divisors (see below), whose sum is σ = 1968458585632. Its totient is φ = 1476343939212.

The previous prime is 1722401262419. The next prime is 1722401262433. The reversal of 1722401262421 is 1242621042271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1722401262421 - 2¹ = 1722401262419 is a prime.

It is a super-3 number, since 3×1722401262421³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722401262401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123028661595 + ... + 123028661608.

It is an arithmetic number, because the mean of its divisors is an integer number (492114646408).

Almost surely, 2^{1722401262421} is an apocalyptic number.

It is an amenable number.

1722401262421 is a deficient number, since it is larger than the sum of its proper divisors (246057323211).

1722401262421 is an equidigital number, since it uses as much as digits as its factorization.

1722401262421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246057323210.

The product of its (nonzero) digits is 21504, while the sum is 34.

The spelling of 1722401262421 in words is "one trillion, seven hundred twenty-two billion, four hundred one million, two hundred sixty-two thousand, four hundred twenty-one".