21220232294 has 4 divisors (see below), whose sum is σ = 31830348444. Its totient is φ = 10610116146.

The previous prime is 21220232291. The next prime is 21220232317. The reversal of 21220232294 is 49223202212.

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

It is a super-2 number, since 2×21220232294² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220232291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305058072 + ... + 5305058075.

It is an arithmetic number, because the mean of its divisors is an integer number (7957587111).

Almost surely, 2^21220232294 is an apocalyptic number.

21220232294 is a deficient number, since it is larger than the sum of its proper divisors (10610116150).

21220232294 is a wasteful number, since it uses less digits than its factorization.

21220232294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610116149.

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 21220232294 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-two thousand, two hundred ninety-four".