21070537369 has 8 divisors (see below), whose sum is σ = 25348015040. Its totient is φ = 17109909936.

The previous prime is 21070537357. The next prime is 21070537487. The reversal of 21070537369 is 96373507012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21070537369 - 2¹³ = 21070529177 is a prime.

It is a super-2 number, since 2×21070537369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21070537339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79212414 + ... + 79212679.

It is an arithmetic number, because the mean of its divisors is an integer number (3168501880).

Almost surely, 2^21070537369 is an apocalyptic number.

It is an amenable number.

21070537369 is a deficient number, since it is larger than the sum of its proper divisors (4277477671).

21070537369 is a wasteful number, since it uses less digits than its factorization.

21070537369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158425119.

The product of its (nonzero) digits is 238140, while the sum is 43.

The spelling of 21070537369 in words is "twenty-one billion, seventy million, five hundred thirty-seven thousand, three hundred sixty-nine".