21953697007 has 8 divisors (see below), whose sum is σ = 23978597760. Its totient is φ = 19933647960.

The previous prime is 21953697001. The next prime is 21953697011. The reversal of 21953697007 is 70079635912.

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 21953697007 - 2¹⁹ = 21953172719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21953697001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1203457 + ... + 1221562.

It is an arithmetic number, because the mean of its divisors is an integer number (2997324720).

Almost surely, 2^21953697007 is an apocalyptic number.

21953697007 is a deficient number, since it is larger than the sum of its proper divisors (2024900753).

21953697007 is a wasteful number, since it uses less digits than its factorization.

21953697007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425853.

The product of its (nonzero) digits is 714420, while the sum is 49.

The spelling of 21953697007 in words is "twenty-one billion, nine hundred fifty-three million, six hundred ninety-seven thousand, seven".