20121422500 has 45 divisors (see below), whose sum is σ = 44017042069. Its totient is φ = 8045732000.

The previous prime is 20121422483. The next prime is 20121422527. The reversal of 20121422500 is 522412102.

The square root of 20121422500 is 141850.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 19930098276 + 191324224 = 141174^2 + 13832^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 7091082 + ... + 7093918.

Almost surely, 2^20121422500 is an apocalyptic number.

20121422500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

20121422500 is the 141850-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121422500

20121422500 is an abundant number, since it is smaller than the sum of its proper divisors (23895619569).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20121422500 is an frugal number, since it uses more digits than its factorization.

20121422500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5698 (or 2844 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 20121422500 its reverse (522412102), we get a palindrome (20643834602).

The spelling of 20121422500 in words is "twenty billion, one hundred twenty-one million, four hundred twenty-two thousand, five hundred".