21294505420106 has 16 divisors (see below), whose sum is σ = 32004454454784. Its totient is φ = 10626365433744.

The previous prime is 21294505420073. The next prime is 21294505420157. The reversal of 21294505420106 is 60102450549212.

It is a super-2 number, since 2×21294505420106² (a number of 27 digits) contains 22 as substring.

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, 833375 + ... + 6579021.

It is an arithmetic number, because the mean of its divisors is an integer number (2000278403424).

Almost surely, 2^{21294505420106} is an apocalyptic number.

21294505420106 is a deficient number, since it is larger than the sum of its proper divisors (10709949034678).

21294505420106 is a wasteful number, since it uses less digits than its factorization.

21294505420106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5749285.

The product of its (nonzero) digits is 172800, while the sum is 41.

Adding to 21294505420106 its reverse (60102450549212), we get a palindrome (81396955969318).

The spelling of 21294505420106 in words is "twenty-one trillion, two hundred ninety-four billion, five hundred five million, four hundred twenty thousand, one hundred six".