7205537021 has 4 divisors (see below), whose sum is σ = 7209180000. Its totient is φ = 7201894044.

The previous prime is 7205537011. The next prime is 7205537081. The reversal of 7205537021 is 1207355027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1207355027 = 19249 ⋅62723.

It is a cyclic number.

It is not a de Polignac number, because 7205537021 - 2⁶ = 7205536957 is a prime.

It is a super-2 number, since 2×7205537021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7205537011) 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, 1818521 + ... + 1822478.

It is an arithmetic number, because the mean of its divisors is an integer number (1802295000).

Almost surely, 2^7205537021 is an apocalyptic number.

It is an amenable number.

7205537021 is a deficient number, since it is larger than the sum of its proper divisors (3642979).

7205537021 is a wasteful number, since it uses less digits than its factorization.

7205537021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3642978.

The product of its (nonzero) digits is 14700, while the sum is 32.

The square root of 7205537021 is about 84885.4346811042. The cubic root of 7205537021 is about 1931.4736363582.

The spelling of 7205537021 in words is "seven billion, two hundred five million, five hundred thirty-seven thousand, twenty-one".