21621404102245 has 8 divisors (see below), whose sum is σ = 26549072944416. Its totient is φ = 16894864600656.

The previous prime is 21621404102239. The next prime is 21621404102251. The reversal of 21621404102245 is 54220140412612.

It is an interprime number because it is at equal distance from previous prime (21621404102239) and next prime (21621404102251).

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

It is a cyclic number.

It is not a de Polignac number, because 21621404102245 - 2¹³ = 21621404094053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21621404102245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50282334907 + ... + 50282335336.

It is an arithmetic number, because the mean of its divisors is an integer number (3318634118052).

Almost surely, 2^{21621404102245} is an apocalyptic number.

It is an amenable number.

21621404102245 is a deficient number, since it is larger than the sum of its proper divisors (4927668842171).

21621404102245 is a wasteful number, since it uses less digits than its factorization.

21621404102245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100564670291.

The product of its (nonzero) digits is 30720, while the sum is 34.

Adding to 21621404102245 its reverse (54220140412612), we get a palindrome (75841544514857).

The spelling of 21621404102245 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred four million, one hundred two thousand, two hundred forty-five".