21220400303030 has 32 divisors (see below), whose sum is σ = 38720854242144. Its totient is φ = 8371691318016.

The previous prime is 21220400302951. The next prime is 21220400303033. The reversal of 21220400303030 is 3030300402212.

It is a junction number, because it is equal to n+sod(n) for n = 21220400302993 and 21220400303011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220400303033) 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, 33796712 + ... + 34418868.

It is an arithmetic number, because the mean of its divisors is an integer number (1210026695067).

Almost surely, 2^{21220400303030} is an apocalyptic number.

21220400303030 is a deficient number, since it is larger than the sum of its proper divisors (17500453939114).

21220400303030 is a wasteful number, since it uses less digits than its factorization.

21220400303030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668960.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21220400303030 its reverse (3030300402212), we get a palindrome (24250700705242).

The spelling of 21220400303030 in words is "twenty-one trillion, two hundred twenty billion, four hundred million, three hundred three thousand, thirty".