1011211212421 has 16 divisors (see below), whose sum is σ = 1085748928000. Its totient is φ = 938948815728.

The previous prime is 1011211212409. The next prime is 1011211212433. The reversal of 1011211212421 is 1242121121101.

1011211212421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1011211212409) and next prime (1011211212433).

It is a cyclic number.

It is not a de Polignac number, because 1011211212421 - 2²⁷ = 1011076994693 is a prime.

It is a super-2 number, since 2×1011211212421² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011211212481) 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, 1742535 + ... + 2249188.

It is an arithmetic number, because the mean of its divisors is an integer number (67859308000).

Almost surely, 2^{1011211212421} is an apocalyptic number.

It is an amenable number.

1011211212421 is a deficient number, since it is larger than the sum of its proper divisors (74537715579).

1011211212421 is a wasteful number, since it uses less digits than its factorization.

1011211212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992008.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 1011211212421 its reverse (1242121121101), we get a palindrome (2253332333522).

The spelling of 1011211212421 in words is "one trillion, eleven billion, two hundred eleven million, two hundred twelve thousand, four hundred twenty-one".