1012981221810 has 80 divisors (see below), whose sum is σ = 2742074775000. Its totient is φ = 268315352064.

The previous prime is 1012981221787. The next prime is 1012981221841. The reversal of 1012981221810 is 181221892101.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 236659871529 + 776321350281 = 486477^2 + 881091^2 .

It is a super-2 number, since 2×1012981221810² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4075935 + ... + 4317314.

Almost surely, 2^{1012981221810} is an apocalyptic number.

1012981221810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1012981221810 is an abundant number, since it is smaller than the sum of its proper divisors (1729093553190).

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

1012981221810 is a wasteful number, since it uses less digits than its factorization.

1012981221810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8393417 (or 8393408 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The spelling of 1012981221810 in words is "one trillion, twelve billion, nine hundred eighty-one million, two hundred twenty-one thousand, eight hundred ten".