21350131 has 8 divisors (see below), whose sum is σ = 23326128. Its totient is φ = 19380000.

The previous prime is 21350111. The next prime is 21350137. The reversal of 21350131 is 13105312.

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

It is a cyclic number.

It is not a de Polignac number, because 21350131 - 2¹¹ = 21348083 is a prime.

It is a super-2 number, since 2×21350131² = 911656187434322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21350137) 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, 10281 + ... + 12181.

It is an arithmetic number, because the mean of its divisors is an integer number (2915766).

Almost surely, 2^21350131 is an apocalyptic number.

21350131 is a deficient number, since it is larger than the sum of its proper divisors (1975997).

21350131 is a wasteful number, since it uses less digits than its factorization.

21350131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 21350131 is about 4620.6201964671. The cubic root of 21350131 is about 277.4172834654.

Adding to 21350131 its reverse (13105312), we get a palindrome (34455443).

The spelling of 21350131 in words is "twenty-one million, three hundred fifty thousand, one hundred thirty-one".