21621406366002 has 32 divisors (see below), whose sum is σ = 44040128405760. Its totient is φ = 7074607213520.

The previous prime is 21621406365971. The next prime is 21621406366009. The reversal of 21621406366002 is 20066360412612.

It is not an unprimeable number, because it can be changed into a prime (21621406366009) 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, 44470824 + ... + 44954387.

It is an arithmetic number, because the mean of its divisors is an integer number (1376254012680).

Almost surely, 2^{21621406366002} is an apocalyptic number.

21621406366002 is an abundant number, since it is smaller than the sum of its proper divisors (22418722039758).

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

21621406366002 is a wasteful number, since it uses less digits than its factorization.

21621406366002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89425958.

The product of its (nonzero) digits is 124416, while the sum is 39.

Adding to 21621406366002 its reverse (20066360412612), we get a palindrome (41687766778614).

The spelling of 21621406366002 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred six million, three hundred sixty-six thousand, two".