21020330455534 has 8 divisors (see below), whose sum is σ = 32201357293728. Its totient is φ = 10286544690960.

The previous prime is 21020330455529. The next prime is 21020330455559. The reversal of 21020330455534 is 43555403302012.

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 = 21020330455493 and 21020330455502.

It is a congruent number.

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, 111810268287 + ... + 111810268474.

It is an arithmetic number, because the mean of its divisors is an integer number (4025169661716).

Almost surely, 2^{21020330455534} is an apocalyptic number.

21020330455534 is a deficient number, since it is larger than the sum of its proper divisors (11181026838194).

21020330455534 is a wasteful number, since it uses less digits than its factorization.

21020330455534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223620536810.

The product of its (nonzero) digits is 216000, while the sum is 37.

Adding to 21020330455534 its reverse (43555403302012), we get a palindrome (64575733757546).

The spelling of 21020330455534 in words is "twenty-one trillion, twenty billion, three hundred thirty million, four hundred fifty-five thousand, five hundred thirty-four".