1621433421454 has 32 divisors (see below), whose sum is σ = 3038466961152. Its totient is φ = 630440664000.

The previous prime is 1621433421331. The next prime is 1621433421473. The reversal of 1621433421454 is 4541243341261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10646167 + ... + 10797394.

It is an arithmetic number, because the mean of its divisors is an integer number (94952092536).

Almost surely, 2^{1621433421454} is an apocalyptic number.

1621433421454 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1621433421454 is a deficient number, since it is larger than the sum of its proper divisors (1417033539698).

1621433421454 is a wasteful number, since it uses less digits than its factorization.

1621433421454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21444072.

The product of its digits is 276480, while the sum is 40.

The spelling of 1621433421454 in words is "one trillion, six hundred twenty-one billion, four hundred thirty-three million, four hundred twenty-one thousand, four hundred fifty-four".