21121421030 has 16 divisors (see below), whose sum is σ = 38586000240. Its totient is φ = 8322470112.

The previous prime is 21121421021. The next prime is 21121421089. The reversal of 21121421030 is 3012412112.

21121421030 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21121421030² (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 in 7 ways as a sum of consecutive naturals, for example, 15761585 + ... + 15762924.

It is an arithmetic number, because the mean of its divisors is an integer number (2411625015).

Almost surely, 2^21121421030 is an apocalyptic number.

21121421030 is a deficient number, since it is larger than the sum of its proper divisors (17464579210).

21121421030 is a wasteful number, since it uses less digits than its factorization.

21121421030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31524583.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21121421030 its reverse (3012412112), we get a palindrome (24133833142).

The spelling of 21121421030 in words is "twenty-one billion, one hundred twenty-one million, four hundred twenty-one thousand, thirty".