1021660121050 has 24 divisors (see below), whose sum is σ = 1901849391036. Its totient is φ = 408328227840.

The previous prime is 1021660120993. The next prime is 1021660121059. The reversal of 1021660121050 is 501210661201.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 486323522161 + 535336598889 = 697369^2 + 731667^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1021660121059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8334057 + ... + 8455756.

Almost surely, 2^{1021660121050} is an apocalyptic number.

1021660121050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021660121050 is a deficient number, since it is larger than the sum of its proper divisors (880189269986).

1021660121050 is a wasteful number, since it uses less digits than its factorization.

1021660121050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16791042 (or 16791037 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 1021660121050 its reverse (501210661201), we get a palindrome (1522870782251).

The spelling of 1021660121050 in words is "one trillion, twenty-one billion, six hundred sixty million, one hundred twenty-one thousand, fifty".