101409721 has 4 divisors (see below), whose sum is σ = 115896832. Its totient is φ = 86922612.

The previous prime is 101409713. The next prime is 101409733. The reversal of 101409721 is 127904101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 101409721 - 2³ = 101409713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101409701) 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, 7243545 + ... + 7243558.

It is an arithmetic number, because the mean of its divisors is an integer number (28974208).

Almost surely, 2^101409721 is an apocalyptic number.

It is an amenable number.

101409721 is a deficient number, since it is larger than the sum of its proper divisors (14487111).

101409721 is an equidigital number, since it uses as much as digits as its factorization.

101409721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14487110.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 101409721 is about 10070.2393715343. The cubic root of 101409721 is about 466.3298287558.

The spelling of 101409721 in words is "one hundred one million, four hundred nine thousand, seven hundred twenty-one".