1051600021 has 4 divisors (see below), whose sum is σ = 1077248844. Its totient is φ = 1025951200.

The previous prime is 1051600013. The next prime is 1051600037. The reversal of 1051600021 is 1200061501.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114383025 + 937216996 = 10695^2 + 30614^2 .

It is not a de Polignac number, because 1051600021 - 2³ = 1051600013 is a prime.

It is a super-2 number, since 2×1051600021² = 2211725208334400882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1051599968 and 1051600004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051600721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12824350 + ... + 12824431.

It is an arithmetic number, because the mean of its divisors is an integer number (269312211).

Almost surely, 2^1051600021 is an apocalyptic number.

It is an amenable number.

1051600021 is a deficient number, since it is larger than the sum of its proper divisors (25648823).

1051600021 is an equidigital number, since it uses as much as digits as its factorization.

1051600021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25648822.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1051600021 is about 32428.3829538261. The cubic root of 1051600021 is about 1016.9123663921.

Adding to 1051600021 its reverse (1200061501), we get a palindrome (2251661522).

The spelling of 1051600021 in words is "one billion, fifty-one million, six hundred thousand, twenty-one".