21029579983204 has 81 divisors (see below), whose sum is σ = 42062743209753. Its totient is φ = 9194129459424.

The previous prime is 21029579983193. The next prime is 21029579983211. The reversal of 21029579983204 is 40238997592012.

The square root of 21029579983204 is 4585802.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3110884612900 + 17918695370304 = 1763770^2 + 4233048^2 .

It is a super-3 number, since 3×21029579983204³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2265381547 + ... + 2265390829.

Almost surely, 2^{21029579983204} is an apocalyptic number.

21029579983204 is the 4585802-nd square number.

It is an amenable number.

21029579983204 is an abundant number, since it is smaller than the sum of its proper divisors (21033163226549).

21029579983204 is an frugal number, since it uses more digits than its factorization.

21029579983204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18634 (or 9317 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 21029579983204 in words is "twenty-one trillion, twenty-nine billion, five hundred seventy-nine million, nine hundred eighty-three thousand, two hundred four".