1202021561640 has 64 divisors (see below), whose sum is σ = 3615148114560. Its totient is φ = 319731667200.

The previous prime is 1202021561581. The next prime is 1202021561669. The reversal of 1202021561640 is 461651202021.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1202021561598 and 1202021561607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12568036 + ... + 12663315.

It is an arithmetic number, because the mean of its divisors is an integer number (56486689290).

Almost surely, 2^{1202021561640} is an apocalyptic number.

1202021561640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1202021561640 is an abundant number, since it is smaller than the sum of its proper divisors (2413126552920).

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

1202021561640 is a wasteful number, since it uses less digits than its factorization.

1202021561640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25231762 (or 25231758 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 1202021561640 its reverse (461651202021), we get a palindrome (1663672763661).

The spelling of 1202021561640 in words is "one trillion, two hundred two billion, twenty-one million, five hundred sixty-one thousand, six hundred forty".