1021121201 has 16 divisors (see below), whose sum is σ = 1122958080. Its totient is φ = 924622080.

The previous prime is 1021121191. The next prime is 1021121203. The reversal of 1021121201 is 1021211201.

It is a cyclic number.

It is not a de Polignac number, because 1021121201 - 2²⁶ = 954012337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021121203) 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, 36311 + ... + 57971.

It is an arithmetic number, because the mean of its divisors is an integer number (70184880).

Almost surely, 2^1021121201 is an apocalyptic number.

It is an amenable number.

1021121201 is a deficient number, since it is larger than the sum of its proper divisors (101836879).

1021121201 is a wasteful number, since it uses less digits than its factorization.

1021121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21784.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1021121201 is about 31954.9871068664. The cubic root of 1021121201 is about 1006.9914066536.

Adding to 1021121201 its reverse (1021211201), we get a palindrome (2042332402).

Subtracting 1021121201 from its reverse (1021211201), we obtain a square (90000 = 300²).

The spelling of 1021121201 in words is "one billion, twenty-one million, one hundred twenty-one thousand, two hundred one".