1021001299966 has 16 divisors (see below), whose sum is σ = 1621709982144. Its totient is φ = 480435738624.

The previous prime is 1021001299919. The next prime is 1021001299979. The reversal of 1021001299966 is 6699921001201.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637830 + ... + 1564873.

It is an arithmetic number, because the mean of its divisors is an integer number (101356873884).

Almost surely, 2^{1021001299966} is an apocalyptic number.

1021001299966 is a deficient number, since it is larger than the sum of its proper divisors (600708682178).

1021001299966 is a wasteful number, since it uses less digits than its factorization.

1021001299966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216355.

The product of its (nonzero) digits is 104976, while the sum is 46.

The spelling of 1021001299966 in words is "one trillion, twenty-one billion, one million, two hundred ninety-nine thousand, nine hundred sixty-six".