621446523206421 has 16 divisors (see below), whose sum is σ = 903922846152768. Its totient is φ = 376633993747200.

The previous prime is 621446523206381. The next prime is 621446523206423. The reversal of 621446523206421 is 124602325644126.

It is a happy number.

621446523206421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621446523206421 - 2¹³ = 621446523198229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621446523206423) 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, 48291631 + ... + 59791091.

It is an arithmetic number, because the mean of its divisors is an integer number (56495177884548).

Almost surely, 2^{621446523206421} is an apocalyptic number.

It is an amenable number.

621446523206421 is a deficient number, since it is larger than the sum of its proper divisors (282476322946347).

621446523206421 is a wasteful number, since it uses less digits than its factorization.

621446523206421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13137092.

The product of its (nonzero) digits is 3317760, while the sum is 48.

The spelling of 621446523206421 in words is "six hundred twenty-one trillion, four hundred forty-six billion, five hundred twenty-three million, two hundred six thousand, four hundred twenty-one".