1210021401 has 16 divisors (see below), whose sum is σ = 1636128000. Its totient is φ = 795378048.

The previous prime is 1210021399. The next prime is 1210021447. The reversal of 1210021401 is 1041200121.

It is a happy number.

It is not a de Polignac number, because 1210021401 - 2¹ = 1210021399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1210021601) 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, 51360 + ... + 71118.

It is an arithmetic number, because the mean of its divisors is an integer number (102258000).

Almost surely, 2^1210021401 is an apocalyptic number.

It is an amenable number.

1210021401 is a deficient number, since it is larger than the sum of its proper divisors (426106599).

1210021401 is a wasteful number, since it uses less digits than its factorization.

1210021401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20048.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1210021401 is about 34785.3618782384. The cubic root of 1210021401 is about 1065.6085190859.

Adding to 1210021401 its reverse (1041200121), we get a palindrome (2251221522).

The spelling of 1210021401 in words is "one billion, two hundred ten million, twenty-one thousand, four hundred one".