1021660121036 has 6 divisors (see below), whose sum is σ = 1787905211820. Its totient is φ = 510830060516.

The previous prime is 1021660120993. The next prime is 1021660121059. The reversal of 1021660121036 is 6301210661201.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127707515126 + ... + 127707515133.

It is an arithmetic number, because the mean of its divisors is an integer number (297984201970).

Almost surely, 2^{1021660121036} is an apocalyptic number.

It is an amenable number.

1021660121036 is a deficient number, since it is larger than the sum of its proper divisors (766245090784).

1021660121036 is a wasteful number, since it uses less digits than its factorization.

1021660121036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255415030263 (or 255415030261 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

Adding to 1021660121036 its reverse (6301210661201), we get a palindrome (7322870782237).

The spelling of 1021660121036 in words is "one trillion, twenty-one billion, six hundred sixty million, one hundred twenty-one thousand, thirty-six".