1221000640802 has 32 divisors (see below), whose sum is σ = 1963103688000. Its totient is φ = 567520273408.

The previous prime is 1221000640789. The next prime is 1221000640807. The reversal of 1221000640802 is 2080460001221.

It is a happy number.

It is a super-4 number, since 4×1221000640802⁴ (a number of 49 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221000640807) 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, 11372849 + ... + 11479707.

It is an arithmetic number, because the mean of its divisors is an integer number (61346990250).

Almost surely, 2^{1221000640802} is an apocalyptic number.

1221000640802 is a deficient number, since it is larger than the sum of its proper divisors (742103047198).

1221000640802 is a wasteful number, since it uses less digits than its factorization.

1221000640802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111010.

The product of its (nonzero) digits is 1536, while the sum is 26.

The spelling of 1221000640802 in words is "one trillion, two hundred twenty-one billion, six hundred forty thousand, eight hundred two".