1021211220021 has 8 divisors (see below), whose sum is σ = 1420815610560. Its totient is φ = 651207154752.

The previous prime is 1021211220013. The next prime is 1021211220023. The reversal of 1021211220021 is 1200221121201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021211220021 - 2³ = 1021211220013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211220023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7400081236 + ... + 7400081373.

It is an arithmetic number, because the mean of its divisors is an integer number (177601951320).

Almost surely, 2^{1021211220021} is an apocalyptic number.

It is an amenable number.

1021211220021 is a deficient number, since it is larger than the sum of its proper divisors (399604390539).

1021211220021 is a wasteful number, since it uses less digits than its factorization.

1021211220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14800162635.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1021211220021 its reverse (1200221121201), we get a palindrome (2221432341222).

The spelling of 1021211220021 in words is "one trillion, twenty-one billion, two hundred eleven million, two hundred twenty thousand, twenty-one".