21615556342026 has 32 divisors (see below), whose sum is σ = 44723517782400. Its totient is φ = 6956469898560.

The previous prime is 21615556341989. The next prime is 21615556342031. The reversal of 21615556342026 is 62024365551612.

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, 2350995 + ... + 6982713.

It is an arithmetic number, because the mean of its divisors is an integer number (1397609930700).

Almost surely, 2^{21615556342026} is an apocalyptic number.

21615556342026 is an abundant number, since it is smaller than the sum of its proper divisors (23107961440374).

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

21615556342026 is a wasteful number, since it uses less digits than its factorization.

21615556342026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4658574.

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 21615556342026 in words is "twenty-one trillion, six hundred fifteen billion, five hundred fifty-six million, three hundred forty-two thousand, twenty-six".