21121222294 has 4 divisors (see below), whose sum is σ = 31681833444. Its totient is φ = 10560611146.

The previous prime is 21121222279. The next prime is 21121222303. The reversal of 21121222294 is 49222212112.

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

It is a super-2 number, since 2×21121222294² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280305572 + ... + 5280305575.

It is an arithmetic number, because the mean of its divisors is an integer number (7920458361).

Almost surely, 2^21121222294 is an apocalyptic number.

21121222294 is a deficient number, since it is larger than the sum of its proper divisors (10560611150).

21121222294 is a wasteful number, since it uses less digits than its factorization.

21121222294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560611149.

The product of its digits is 2304, while the sum is 28.

The spelling of 21121222294 in words is "twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred ninety-four".