21950531249 has 8 divisors (see below), whose sum is σ = 22112045760. Its totient is φ = 21789068400.

The previous prime is 21950531231. The next prime is 21950531327. The reversal of 21950531249 is 94213505912.

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 21950531249 - 2¹² = 21950527153 is a prime.

It is a super-2 number, since 2×21950531249² (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 (21950530249) 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, 1407404 + ... + 1422914.

It is an arithmetic number, because the mean of its divisors is an integer number (2764005720).

Almost surely, 2^21950531249 is an apocalyptic number.

It is an amenable number.

21950531249 is a deficient number, since it is larger than the sum of its proper divisors (161514511).

21950531249 is a wasteful number, since it uses less digits than its factorization.

21950531249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25831.

The product of its (nonzero) digits is 97200, while the sum is 41.

The spelling of 21950531249 in words is "twenty-one billion, nine hundred fifty million, five hundred thirty-one thousand, two hundred forty-nine".