1420335451621 has 4 divisors (see below), whose sum is σ = 1503884595852. Its totient is φ = 1336786307392.

The previous prime is 1420335451547. The next prime is 1420335451651. The reversal of 1420335451621 is 1261545330241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 746107250625 + 674228200996 = 863775^2 + 821114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1420335451621 - 2²¹ = 1420333354469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420335451651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41774572090 + ... + 41774572123.

It is an arithmetic number, because the mean of its divisors is an integer number (375971148963).

Almost surely, 2^{1420335451621} is an apocalyptic number.

It is an amenable number.

1420335451621 is a deficient number, since it is larger than the sum of its proper divisors (83549144231).

1420335451621 is an equidigital number, since it uses as much as digits as its factorization.

1420335451621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83549144230.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 1420335451621 in words is "one trillion, four hundred twenty billion, three hundred thirty-five million, four hundred fifty-one thousand, six hundred twenty-one".