70720121 has 8 divisors (see below), whose sum is σ = 72576000. Its totient is φ = 68870560.

The previous prime is 70720103. The next prime is 70720123. The reversal of 70720121 is 12102707.

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 70720121 - 2⁶ = 70720057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70720093 and 70720102.

It is not an unprimeable number, because it can be changed into a prime (70720123) 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, 28280 + ... + 30678.

It is an arithmetic number, because the mean of its divisors is an integer number (9072000).

Almost surely, 2^70720121 is an apocalyptic number.

It is an amenable number.

70720121 is a deficient number, since it is larger than the sum of its proper divisors (1855879).

70720121 is a wasteful number, since it uses less digits than its factorization.

70720121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3159.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 70720121 is about 8409.5256108772. The cubic root of 70720121 is about 413.5369608157.

Adding to 70720121 its reverse (12102707), we get a palindrome (82822828).

The spelling of 70720121 in words is "seventy million, seven hundred twenty thousand, one hundred twenty-one".