101621636443 has 4 divisors (see below), whose sum is σ = 101636673768. Its totient is φ = 101606599120.

The previous prime is 101621636407. The next prime is 101621636447. The reversal of 101621636443 is 344636126101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 101621636443 - 2²¹ = 101619539291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101621636447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7508521 + ... + 7522042.

It is an arithmetic number, because the mean of its divisors is an integer number (25409168442).

Almost surely, 2^101621636443 is an apocalyptic number.

101621636443 is a deficient number, since it is larger than the sum of its proper divisors (15037325).

101621636443 is an equidigital number, since it uses as much as digits as its factorization.

101621636443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15037324.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 101621636443 in words is "one hundred one billion, six hundred twenty-one million, six hundred thirty-six thousand, four hundred forty-three".