21148640726290 has 32 divisors (see below), whose sum is σ = 47460845683584. Its totient is φ = 6591784122240.

The previous prime is 21148640726261. The next prime is 21148640726321. The reversal of 21148640726290 is 9262704684112.

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, 13732882819 + ... + 13732884358.

It is an arithmetic number, because the mean of its divisors is an integer number (1483151427612).

Almost surely, 2^{21148640726290} is an apocalyptic number.

21148640726290 is an abundant number, since it is smaller than the sum of its proper divisors (26312204957294).

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

21148640726290 is a wasteful number, since it uses less digits than its factorization.

21148640726290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27465767202.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 21148640726290 in words is "twenty-one trillion, one hundred forty-eight billion, six hundred forty million, seven hundred twenty-six thousand, two hundred ninety".