21330166426402 has 4 divisors (see below), whose sum is σ = 31995249639606. Its totient is φ = 10665083213200.

The previous prime is 21330166426399. The next prime is 21330166426421. The reversal of 21330166426402 is 20462466103312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17257967541441 + 4072198884961 = 4154271^2 + 2017969^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5332541606599 + ... + 5332541606602.

Almost surely, 2^{21330166426402} is an apocalyptic number.

21330166426402 is a deficient number, since it is larger than the sum of its proper divisors (10665083213204).

21330166426402 is a wasteful number, since it uses less digits than its factorization.

21330166426402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10665083213203.

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 21330166426402 in words is "twenty-one trillion, three hundred thirty billion, one hundred sixty-six million, four hundred twenty-six thousand, four hundred two".