1972222213 has 4 divisors (see below), whose sum is σ = 2123931628. Its totient is φ = 1820512800.

The previous prime is 1972222177. The next prime is 1972222229. The reversal of 1972222213 is 3122222791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3122222791 = 23 ⋅135748817.

It can be written as a sum of positive squares in 2 ways, for example, as 1332031009 + 640191204 = 36497^2 + 25302^2 .

It is a cyclic number.

It is not a de Polignac number, because 1972222213 - 2²¹ = 1970125061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1972222613) 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, 75854688 + ... + 75854713.

It is an arithmetic number, because the mean of its divisors is an integer number (530982907).

Almost surely, 2^1972222213 is an apocalyptic number.

1972222213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1972222213 is a deficient number, since it is larger than the sum of its proper divisors (151709415).

1972222213 is a wasteful number, since it uses less digits than its factorization.

1972222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151709414.

The product of its digits is 6048, while the sum is 31.

The square root of 1972222213 is about 44409.7085444163. The cubic root of 1972222213 is about 1254.0608653188.

The spelling of 1972222213 in words is "one billion, nine hundred seventy-two million, two hundred twenty-two thousand, two hundred thirteen".