70211621 has 6 divisors (see below), whose sum is σ = 72550566. Its totient is φ = 67945800.

The previous prime is 70211611. The next prime is 70211627. The reversal of 70211621 is 12611207.

It can be written as a sum of positive squares in only one way, i.e., 40780996 + 29430625 = 6386^2 + 5425^2 .

It is a de Polignac number, because none of the positive numbers 2^k-70211621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70211593 and 70211602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70211627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35570 + ... + 37491.

It is an arithmetic number, because the mean of its divisors is an integer number (12091761).

Almost surely, 2^70211621 is an apocalyptic number.

It is an amenable number.

70211621 is a deficient number, since it is larger than the sum of its proper divisors (2338945).

70211621 is an equidigital number, since it uses as much as digits as its factorization.

70211621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73123 (or 73092 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 70211621 is about 8379.2374951424. The cubic root of 70211621 is about 412.5434219365.

Adding to 70211621 its reverse (12611207), we get a palindrome (82822828).

The spelling of 70211621 in words is "seventy million, two hundred eleven thousand, six hundred twenty-one".