20130221705 has 16 divisors (see below), whose sum is σ = 26365176000. Its totient is φ = 14633002560.

The previous prime is 20130221693. The next prime is 20130221717. The reversal of 20130221705 is 50712203102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20130221693) and next prime (20130221717).

It is not a de Polignac number, because 20130221705 - 2⁴ = 20130221689 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25346 + ... + 202244.

It is an arithmetic number, because the mean of its divisors is an integer number (1647823500).

Almost surely, 2^20130221705 is an apocalyptic number.

It is an amenable number.

20130221705 is a deficient number, since it is larger than the sum of its proper divisors (6234954295).

20130221705 is a wasteful number, since it uses less digits than its factorization.

20130221705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178984.

The product of its (nonzero) digits is 840, while the sum is 23.

Adding to 20130221705 its reverse (50712203102), we get a palindrome (70842424807).

The spelling of 20130221705 in words is "twenty billion, one hundred thirty million, two hundred twenty-one thousand, seven hundred five".