1621420768954 has 16 divisors (see below), whose sum is σ = 2779816536000. Its totient is φ = 694835096544.

The previous prime is 1621420768883. The next prime is 1621420768993. The reversal of 1621420768954 is 4598670241261.

It is a junction number, because it is equal to n+sod(n) for n = 1621420768895 and 1621420768904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4790404 + ... + 5117695.

It is an arithmetic number, because the mean of its divisors is an integer number (173738533500).

Almost surely, 2^{1621420768954} is an apocalyptic number.

1621420768954 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1621420768954 is a deficient number, since it is larger than the sum of its proper divisors (1158395767046).

1621420768954 is a wasteful number, since it uses less digits than its factorization.

1621420768954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9919797.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 1621420768954 in words is "one trillion, six hundred twenty-one billion, four hundred twenty million, seven hundred sixty-eight thousand, nine hundred fifty-four".