21121222476 has 48 divisors (see below), whose sum is σ = 49617478400. Its totient is φ = 6992661312.

The previous prime is 21121222457. The next prime is 21121222477. The reversal of 21121222476 is 67422212112.

It is a super-2 number, since 2×21121222476² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121222477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4435785 + ... + 4440543.

Almost surely, 2^21121222476 is an apocalyptic number.

It is an amenable number.

21121222476 is an abundant number, since it is smaller than the sum of its proper divisors (28496255924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121222476 is a wasteful number, since it uses less digits than its factorization.

21121222476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7198 (or 7196 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

Adding to 21121222476 its reverse (67422212112), we get a palindrome (88543434588).

The spelling of 21121222476 in words is "twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, four hundred seventy-six".