21949829297 has 16 divisors (see below), whose sum is σ = 24146314944. Its totient is φ = 19787544000.

The previous prime is 21949829281. The next prime is 21949829323. The reversal of 21949829297 is 79292894912.

It is a cyclic number.

It is not a de Polignac number, because 21949829297 - 2⁴ = 21949829281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21949829257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 625847 + ... + 659987.

It is an arithmetic number, because the mean of its divisors is an integer number (1509144684).

Almost surely, 2^21949829297 is an apocalyptic number.

It is an amenable number.

21949829297 is a deficient number, since it is larger than the sum of its proper divisors (2196485647).

21949829297 is a wasteful number, since it uses less digits than its factorization.

21949829297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34640.

The product of its digits is 11757312, while the sum is 62.

The spelling of 21949829297 in words is "twenty-one billion, nine hundred forty-nine million, eight hundred twenty-nine thousand, two hundred ninety-seven".