21621223561034 has 8 divisors (see below), whose sum is σ = 32431870156320. Its totient is φ = 10810600175596.

The previous prime is 21621223561001. The next prime is 21621223561073. The reversal of 21621223561034 is 43016532212612.

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

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, 3248804 + ... + 7334655.

It is an arithmetic number, because the mean of its divisors is an integer number (4053983769540).

Almost surely, 2^{21621223561034} is an apocalyptic number.

21621223561034 is a deficient number, since it is larger than the sum of its proper divisors (10810646595286).

21621223561034 is a wasteful number, since it uses less digits than its factorization.

21621223561034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11604924.

The product of its (nonzero) digits is 103680, while the sum is 38.

Adding to 21621223561034 its reverse (43016532212612), we get a palindrome (64637755773646).

The spelling of 21621223561034 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twenty-three million, five hundred sixty-one thousand, thirty-four".