21121004030 has 128 divisors (see below), whose sum is σ = 45242136576. Its totient is φ = 6950361600.

The previous prime is 21121003997. The next prime is 21121004053. The reversal of 21121004030 is 3040012112.

It is a super-2 number, since 2×21121004030² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21121003996 and 21121004014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 47676989 + ... + 47677431.

It is an arithmetic number, because the mean of its divisors is an integer number (353454192).

Almost surely, 2^21121004030 is an apocalyptic number.

21121004030 is an abundant number, since it is smaller than the sum of its proper divisors (24121132546).

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

21121004030 is a wasteful number, since it uses less digits than its factorization.

21121004030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21121004030 its reverse (3040012112), we get a palindrome (24161016142).

The spelling of 21121004030 in words is "twenty-one billion, one hundred twenty-one million, four thousand, thirty".