70542221 has 4 divisors (see below), whose sum is σ = 70911744. Its totient is φ = 70172700.

The previous prime is 70542209. The next prime is 70542257. The reversal of 70542221 is 12224507.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70542221 is a prime.

It is a super-2 number, since 2×70542221² = 9952409887225682, 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 (70541221) 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, 184475 + ... + 184856.

It is an arithmetic number, because the mean of its divisors is an integer number (17727936).

Almost surely, 2^70542221 is an apocalyptic number.

It is an amenable number.

70542221 is a deficient number, since it is larger than the sum of its proper divisors (369523).

70542221 is a wasteful number, since it uses less digits than its factorization.

70542221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369522.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 70542221 is about 8398.9416595188. The cubic root of 70542221 is about 413.1899120135.

Adding to 70542221 its reverse (12224507), we get a palindrome (82766728).

The spelling of 70542221 in words is "seventy million, five hundred forty-two thousand, two hundred twenty-one".