1221035051552 has 24 divisors (see below), whose sum is σ = 2403963470412. Its totient is φ = 610504646400.

The previous prime is 1221035051503. The next prime is 1221035051557. The reversal of 1221035051552 is 2551505301221.

It can be written as a sum of positive squares in 2 ways, for example, as 1184187945616 + 36847105936 = 1088204^2 + 191956^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (1221035051557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1241402 + ... + 1995782.

Almost surely, 2^{1221035051552} is an apocalyptic number.

It is an amenable number.

1221035051552 is a deficient number, since it is larger than the sum of its proper divisors (1182928418860).

1221035051552 is an equidigital number, since it uses as much as digits as its factorization.

1221035051552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804972 (or 804964 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 1221035051552 in words is "one trillion, two hundred twenty-one billion, thirty-five million, fifty-one thousand, five hundred fifty-two".