1021211010021 has 16 divisors (see below), whose sum is σ = 1366101360000. Its totient is φ = 678565321728.

The previous prime is 1021211010013. The next prime is 1021211010049. The reversal of 1021211010021 is 1200101121201.

It is not a de Polignac number, because 1021211010021 - 2³ = 1021211010013 is a prime.

It is a super-2 number, since 2×1021211010021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021211009979 and 1021211010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211010091) 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, 2959480 + ... + 3286478.

It is an arithmetic number, because the mean of its divisors is an integer number (85381335000).

Almost surely, 2^{1021211010021} is an apocalyptic number.

It is an amenable number.

1021211010021 is a deficient number, since it is larger than the sum of its proper divisors (344890349979).

1021211010021 is a wasteful number, since it uses less digits than its factorization.

1021211010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330428.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1021211010021 its reverse (1200101121201), we get a palindrome (2221312131222).

The spelling of 1021211010021 in words is "one trillion, twenty-one billion, two hundred eleven million, ten thousand, twenty-one".