1221212210023 has 8 divisors (see below), whose sum is σ = 1315160254800. Its totient is φ = 1127265400128.

The previous prime is 1221212210011. The next prime is 1221212210077. The reversal of 1221212210023 is 3200122121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221212210023 - 2⁵ = 1221212209991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221212210003) 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, 3360168 + ... + 3705826.

It is an arithmetic number, because the mean of its divisors is an integer number (164395031850).

Almost surely, 2^{1221212210023} is an apocalyptic number.

1221212210023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221212210023 is a deficient number, since it is larger than the sum of its proper divisors (93948044777).

1221212210023 is a wasteful number, since it uses less digits than its factorization.

1221212210023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617441.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1221212210023 its reverse (3200122121221), we get a palindrome (4421334331244).

The spelling of 1221212210023 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, twenty-three".