21202121032 has 8 divisors (see below), whose sum is σ = 39753976950. Its totient is φ = 10601060512.

The previous prime is 21202121029. The next prime is 21202121051. The reversal of 21202121032 is 23012120212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19356043876 + 1846077156 = 139126^2 + 42966^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21202120997 and 21202121015.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325132557 + ... + 1325132572.

Almost surely, 2^21202121032 is an apocalyptic number.

It is an amenable number.

21202121032 is a deficient number, since it is larger than the sum of its proper divisors (18551855918).

21202121032 is a wasteful number, since it uses less digits than its factorization.

21202121032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650265135 (or 2650265131 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21202121032 its reverse (23012120212), we get a palindrome (44214241244).

The spelling of 21202121032 in words is "twenty-one billion, two hundred two million, one hundred twenty-one thousand, thirty-two".