21010121122 has 4 divisors (see below), whose sum is σ = 31515181686. Its totient is φ = 10505060560.

The previous prime is 21010120951. The next prime is 21010121137. The reversal of 21010121122 is 22112101012.

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

It can be written as a sum of positive squares in only one way, i.e., 20863202481 + 146918641 = 144441^2 + 12121^2 .

It is a super-2 number, since 2×21010121122² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252530279 + ... + 5252530282.

Almost surely, 2^21010121122 is an apocalyptic number.

21010121122 is a deficient number, since it is larger than the sum of its proper divisors (10505060564).

21010121122 is a wasteful number, since it uses less digits than its factorization.

21010121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505060563.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21010121122 its reverse (22112101012), we get a palindrome (43122222134).

The spelling of 21010121122 in words is "twenty-one billion, ten million, one hundred twenty-one thousand, one hundred twenty-two".