21201945093316 has 12 divisors (see below), whose sum is σ = 39957511906732. Its totient is φ = 9785513119968.

The previous prime is 21201945093233. The next prime is 21201945093317. The reversal of 21201945093316 is 61339054910212.

It can be written as a sum of positive squares in 2 ways, for example, as 9448676776900 + 11753268316416 = 3073870^2 + 3428304^2 .

It is not an unprimeable number, because it can be changed into a prime (21201945093317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203864856615 + ... + 203864856718.

Almost surely, 2^{21201945093316} is an apocalyptic number.

21201945093316 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21201945093316 is a deficient number, since it is larger than the sum of its proper divisors (18755566813416).

21201945093316 is a wasteful number, since it uses less digits than its factorization.

21201945093316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407729713350 (or 407729713348 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 21201945093316 in words is "twenty-one trillion, two hundred one billion, nine hundred forty-five million, ninety-three thousand, three hundred sixteen".