70221631 has 4 divisors (see below), whose sum is σ = 70244064. Its totient is φ = 70199200.

The previous prime is 70221629. The next prime is 70221637. The reversal of 70221631 is 13612207.

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 70221631 - 2¹ = 70221629 is a prime.

It is a super-2 number, since 2×70221631² = 9862154920600322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70221637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5575 + ... + 13096.

It is an arithmetic number, because the mean of its divisors is an integer number (17561016).

Almost surely, 2^70221631 is an apocalyptic number.

70221631 is a deficient number, since it is larger than the sum of its proper divisors (22433).

70221631 is a wasteful number, since it uses less digits than its factorization.

70221631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22432.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 70221631 is about 8379.8347835742. The cubic root of 70221631 is about 412.5630263048.

Adding to 70221631 its reverse (13612207), we get a palindrome (83833838).

The spelling of 70221631 in words is "seventy million, two hundred twenty-one thousand, six hundred thirty-one".