20821435154554 has 8 divisors (see below), whose sum is σ = 32239641529728. Its totient is φ = 10074887977980.

The previous prime is 20821435154543. The next prime is 20821435154581. The reversal of 20821435154554 is 45545153412802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20821435154498 and 20821435154507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167914799572 + ... + 167914799695.

It is an arithmetic number, because the mean of its divisors is an integer number (4029955191216).

Almost surely, 2^{20821435154554} is an apocalyptic number.

20821435154554 is a deficient number, since it is larger than the sum of its proper divisors (11418206375174).

20821435154554 is a wasteful number, since it uses less digits than its factorization.

20821435154554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335829599300.

The product of its (nonzero) digits is 3840000, while the sum is 49.

The spelling of 20821435154554 in words is "twenty trillion, eight hundred twenty-one billion, four hundred thirty-five million, one hundred fifty-four thousand, five hundred fifty-four".