1021221200121 has 8 divisors (see below), whose sum is σ = 1361998591104. Its totient is φ = 680628971280.

The previous prime is 1021221200107. The next prime is 1021221200137. The reversal of 1021221200121 is 1210021221201.

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

It is not a de Polignac number, because 1021221200121 - 2¹³ = 1021221191929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021221200121.

It is not an unprimeable number, because it can be changed into a prime (1021221200101) 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, 46277665 + ... + 46299726.

It is an arithmetic number, because the mean of its divisors is an integer number (170249823888).

Almost surely, 2^{1021221200121} is an apocalyptic number.

It is an amenable number.

1021221200121 is a deficient number, since it is larger than the sum of its proper divisors (340777390983).

1021221200121 is an equidigital number, since it uses as much as digits as its factorization.

1021221200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92581071.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1021221200121 its reverse (1210021221201), we get a palindrome (2231242421322).

The spelling of 1021221200121 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred thousand, one hundred twenty-one".