102021212100021 has 8 divisors (see below), whose sum is σ = 136627526337504. Its totient is φ = 67714519631280.

The previous prime is 102021212099969. The next prime is 102021212100061. The reversal of 102021212100021 is 120001212120201.

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

It is not a de Polignac number, because 102021212100021 - 2¹⁵ = 102021212067253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021212100061) 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, 74905441390 + ... + 74905442751.

It is an arithmetic number, because the mean of its divisors is an integer number (17078440792188).

Almost surely, 2^{102021212100021} is an apocalyptic number.

It is an amenable number.

102021212100021 is a deficient number, since it is larger than the sum of its proper divisors (34606314237483).

102021212100021 is a wasteful number, since it uses less digits than its factorization.

102021212100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149810884371.

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

Adding to 102021212100021 its reverse (120001212120201), we get a palindrome (222022424220222).

The spelling of 102021212100021 in words is "one hundred two trillion, twenty-one billion, two hundred twelve million, one hundred thousand, twenty-one".