20621395801 has 8 divisors (see below), whose sum is σ = 20647196064. Its totient is φ = 20595614400.

The previous prime is 20621395789. The next prime is 20621395813. The reversal of 20621395801 is 10859312602.

It is an interprime number because it is at equal distance from previous prime (20621395789) and next prime (20621395813).

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 20621395801 - 2⁷ = 20621395673 is a prime.

It is a super-4 number, since 4×20621395801⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20621395831) 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, 3890385 + ... + 3895681.

It is an arithmetic number, because the mean of its divisors is an integer number (2580899508).

Almost surely, 2^20621395801 is an apocalyptic number.

It is an amenable number.

20621395801 is a deficient number, since it is larger than the sum of its proper divisors (25800263).

20621395801 is a wasteful number, since it uses less digits than its factorization.

20621395801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9431.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 20621395801 in words is "twenty billion, six hundred twenty-one million, three hundred ninety-five thousand, eight hundred one".