1211021420005 has 16 divisors (see below), whose sum is σ = 1490145879600. Its totient is φ = 944250531840.

The previous prime is 1211021419999. The next prime is 1211021420039. The reversal of 1211021420005 is 5000241201121.

It can be written as a sum of positive squares in 8 ways, for example, as 213993208836 + 997028211169 = 462594^2 + 998513^2 .

It is not a de Polignac number, because 1211021420005 - 2⁵ = 1211021419973 is a prime.

It is a super-2 number, since 2×1211021420005² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2720520 + ... + 3134209.

It is an arithmetic number, because the mean of its divisors is an integer number (93134117475).

Almost surely, 2^{1211021420005} is an apocalyptic number.

It is an amenable number.

1211021420005 is a deficient number, since it is larger than the sum of its proper divisors (279124459595).

1211021420005 is a wasteful number, since it uses less digits than its factorization.

1211021420005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5855784.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 1211021420005 its reverse (5000241201121), we get a palindrome (6211262621126).

The spelling of 1211021420005 in words is "one trillion, two hundred eleven billion, twenty-one million, four hundred twenty thousand, five".