21221352511404 has 48 divisors (see below), whose sum is σ = 52434067297248. Its totient is φ = 6657064178688.

The previous prime is 21221352511391. The next prime is 21221352511417. The reversal of 21221352511404 is 40411525312212.

It is an interprime number because it is at equal distance from previous prime (21221352511391) and next prime (21221352511417).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2588839 + ... + 7010334.

It is an arithmetic number, because the mean of its divisors is an integer number (1092376402026).

Almost surely, 2^{21221352511404} is an apocalyptic number.

It is an amenable number.

21221352511404 is an abundant number, since it is smaller than the sum of its proper divisors (31212714785844).

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

21221352511404 is a wasteful number, since it uses less digits than its factorization.

21221352511404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9610034 (or 9610032 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 21221352511404 its reverse (40411525312212), we get a palindrome (61632877823616).

The spelling of 21221352511404 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-two million, five hundred eleven thousand, four hundred four".