2221954397 has 4 divisors (see below), whose sum is σ = 2392873980. Its totient is φ = 2051034816.

The previous prime is 2221954367. The next prime is 2221954421. The reversal of 2221954397 is 7934591222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1387264516 + 834689881 = 37246^2 + 28891^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221954397 - 2⁶ = 2221954333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221954327) 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, 85459772 + ... + 85459797.

It is an arithmetic number, because the mean of its divisors is an integer number (598218495).

Almost surely, 2^2221954397 is an apocalyptic number.

It is an amenable number.

2221954397 is a deficient number, since it is larger than the sum of its proper divisors (170919583).

2221954397 is a wasteful number, since it uses less digits than its factorization.

2221954397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170919582.

The product of its digits is 272160, while the sum is 44.

The square root of 2221954397 is about 47137.6112780442. The cubic root of 2221954397 is about 1304.9034532686.

The spelling of 2221954397 in words is "two billion, two hundred twenty-one million, nine hundred fifty-four thousand, three hundred ninety-seven".