1029961881021 has 16 divisors (see below), whose sum is σ = 1387345291200. Its totient is φ = 679623170688.

The previous prime is 1029961880993. The next prime is 1029961881023. The reversal of 1029961881021 is 1201881699201.

It is a happy number.

It is not a de Polignac number, because 1029961881021 - 2⁵ = 1029961880989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1029961881023) 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, 1353336 + ... + 1972673.

It is an arithmetic number, because the mean of its divisors is an integer number (86709080700).

Almost surely, 2^{1029961881021} is an apocalyptic number.

It is an amenable number.

1029961881021 is a deficient number, since it is larger than the sum of its proper divisors (357383410179).

1029961881021 is a wasteful number, since it uses less digits than its factorization.

1029961881021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327068.

The product of its (nonzero) digits is 124416, while the sum is 48.

The spelling of 1029961881021 in words is "one trillion, twenty-nine billion, nine hundred sixty-one million, eight hundred eighty-one thousand, twenty-one".