21500310420106 has 16 divisors (see below), whose sum is σ = 38460182615424. Its totient is φ = 8813791849104.

The previous prime is 21500310420097. The next prime is 21500310420143. The reversal of 21500310420106 is 60102401300512.

It is a happy 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, 33385574865 + ... + 33385575508.

It is an arithmetic number, because the mean of its divisors is an integer number (2403761413464).

Almost surely, 2^{21500310420106} is an apocalyptic number.

21500310420106 is a deficient number, since it is larger than the sum of its proper divisors (16959872195318).

21500310420106 is a wasteful number, since it uses less digits than its factorization.

21500310420106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66771150405.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21500310420106 its reverse (60102401300512), we get a palindrome (81602711720618).

The spelling of 21500310420106 in words is "twenty-one trillion, five hundred billion, three hundred ten million, four hundred twenty thousand, one hundred six".