21000938453386 has 32 divisors (see below), whose sum is σ = 33836513211648. Its totient is φ = 9752826969600.

The previous prime is 21000938453381. The next prime is 21000938453387. The reversal of 21000938453386 is 68335483900012.

It is not an unprimeable number, because it can be changed into a prime (21000938453381) 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, 44165590 + ... + 44638561.

It is an arithmetic number, because the mean of its divisors is an integer number (1057391037864).

Almost surely, 2^{21000938453386} is an apocalyptic number.

21000938453386 is a deficient number, since it is larger than the sum of its proper divisors (12835574758262).

21000938453386 is a wasteful number, since it uses less digits than its factorization.

21000938453386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88804326.

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 21000938453386 in words is "twenty-one trillion, nine hundred thirty-eight million, four hundred fifty-three thousand, three hundred eighty-six".