21002011202000 has 80 divisors (see below), whose sum is σ = 50880337516944. Its totient is φ = 8384679680000.

The previous prime is 21002011201933. The next prime is 21002011202017. The reversal of 21002011202000 is 20211020012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7587138034576 + 13414873167424 = 2754476^2 + 3662632^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 9035741 + ... + 11119740.

Almost surely, 2^{21002011202000} is an apocalyptic number.

21002011202000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002011202000 is an abundant number, since it is smaller than the sum of its proper divisors (29878326314944).

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

21002011202000 is a wasteful number, since it uses less digits than its factorization.

21002011202000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20156025 (or 20156009 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002011202000 its reverse (20211020012), we get a palindrome (21022222222012).

The spelling of 21002011202000 in words is "twenty-one trillion, two billion, eleven million, two hundred two thousand".