1212020221000 has 32 divisors (see below), whose sum is σ = 2836127319480. Its totient is φ = 484808088000.

The previous prime is 1212020220997. The next prime is 1212020221003. The reversal of 1212020221000 is 1220202121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1212020220997) and next prime (1212020221003).

It can be written as a sum of positive squares in 4 ways, for example, as 816879746596 + 395140474404 = 903814^2 + 628602^2 .

It is a super-2 number, since 2×1212020221000² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212020221003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 606009111 + ... + 606011110.

Almost surely, 2^{1212020221000} is an apocalyptic number.

1212020221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212020221000 is an abundant number, since it is smaller than the sum of its proper divisors (1624107098480).

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

1212020221000 is a wasteful number, since it uses less digits than its factorization.

1212020221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212020242 (or 1212020228 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1212020221000 its reverse (1220202121), we get a palindrome (1213240423121).

The spelling of 1212020221000 in words is "one trillion, two hundred twelve billion, twenty million, two hundred twenty-one thousand".