21621403062346 has 8 divisors (see below), whose sum is σ = 32432544161280. Its totient is φ = 10810555008588.

The previous prime is 21621403062293. The next prime is 21621403062359. The reversal of 21621403062346 is 64326030412612.

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 = 21621403062299 and 21621403062308.

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, 73076746 + ... + 73372021.

It is an arithmetic number, because the mean of its divisors is an integer number (4054068020160).

Almost surely, 2^{21621403062346} is an apocalyptic number.

21621403062346 is a deficient number, since it is larger than the sum of its proper divisors (10811141098934).

21621403062346 is a wasteful number, since it uses less digits than its factorization.

21621403062346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146522588.

The product of its (nonzero) digits is 248832, while the sum is 40.

Adding to 21621403062346 its reverse (64326030412612), we get a palindrome (85947433474958).

The spelling of 21621403062346 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred three million, sixty-two thousand, three hundred forty-six".