21953697006 has 16 divisors (see below), whose sum is σ = 43911244800. Its totient is φ = 7317257208.

The previous prime is 21953697001. The next prime is 21953697011. The reversal of 21953697006 is 60079635912.

It is an interprime number because it is at equal distance from previous prime (21953697001) and next prime (21953697011).

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83496 + ... + 225563.

It is an arithmetic number, because the mean of its divisors is an integer number (2744452800).

Almost surely, 2^21953697006 is an apocalyptic number.

21953697006 is an abundant number, since it is smaller than the sum of its proper divisors (21957547794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21953697006 is a wasteful number, since it uses less digits than its factorization.

21953697006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320903.

The product of its (nonzero) digits is 612360, while the sum is 48.

The spelling of 21953697006 in words is "twenty-one billion, nine hundred fifty-three million, six hundred ninety-seven thousand, six".