1211000023021 has 16 divisors (see below), whose sum is σ = 1234160925120. Its totient is φ = 1187929013760.

The previous prime is 1211000022997. The next prime is 1211000023027. The reversal of 1211000023021 is 1203200001121.

It is a cyclic number.

It is not a de Polignac number, because 1211000023021 - 2¹⁷ = 1210999891949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211000022992 and 1211000023010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211000023027) 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, 82200226 + ... + 82214956.

It is an arithmetic number, because the mean of its divisors is an integer number (77135057820).

Almost surely, 2^{1211000023021} is an apocalyptic number.

It is an amenable number.

1211000023021 is a deficient number, since it is larger than the sum of its proper divisors (23160902099).

1211000023021 is a wasteful number, since it uses less digits than its factorization.

1211000023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17676.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1211000023021 its reverse (1203200001121), we get a palindrome (2414200024142).

The spelling of 1211000023021 in words is "one trillion, two hundred eleven billion, twenty-three thousand, twenty-one".